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dbx(1)									dbx(1)

       dbx - debugger

       dbx [-r] [-i] [-k] [-I dir] [-c file] [objfile[coredump]]

       The debugger is a tool for source level debugging and execution of pro‐
       grams running under the ULTRIX operating system. Once  you  invoke  you
       can  issue  commands  that  control  and trace program execution, print
       variable and expression values, and display and edit source files.

       You can use command options to modify some steps that  performs	during
       startup.	 (For  information  on	the  available	options, see Options.)
       Unless you specify the -r option, prompts you for a command  before  it
       begins executing your program. The prompt appears as follows:
       To leave issue the quit command.

       On  the	command	 line, the objfile argument names the object file that
       you want to read as input. For complete support, the object  file  must
       contain extended symbol table information. The supported compilers each
       have an option, -g , that produces the symbol table information in  the
       object file.

       The  extended  symbol table contains information that makes your debug‐
       ging session more convenient.  For example, the extended	 symbol	 table
       contains	 the  names of all the source files translated by the compiler
       to create the object file.  This information allows you to look at  all
       the  source  code  that	went  into creating an object file during your
       debugging session.

       If your object file does not contain the extended symbol table, use the
       commands described in Machine Level Commands to debug your program.

       If you omit the objfile argument, prompts you for the name of an object
       file. If you press the Return key, attempts to read a file  named  from
       the  current  directory.	 If  no	 file exists, issues another prompt to
       allow you to enter a file name. If you press the Return key, exits.

       The coredump argument names a core dump file. You can examine the  core
       dump file to determine the state of your program.  If you omit coredump
       and a core file exists in the current directory, reads in a file named

   Initialization File
       During its startup, reads and executes the commands in  an  initializa‐
       tion  file, if one is present. By default, searches for the file in the
       current directory.   If	no  file  exists  in  the  current  directory,
       searches	 your home directory for the file. You can use the initializa‐
       tion file to automatically issue setup commands when you begin  a  ses‐

       You  can rename the debugger. If you rename the debugger, you must also
       rename its initialization file. The debugger expects the initialization
       file's  name to be a period (.), followed by the first eight characters
       in the debugger's name, followed by the	string	For  example,  if  you
       rename to the debugger searches for an initialization file named

       -cfile Executes	the commands in the specified file before reading from
	      standard input.

       -i     Forces to act as though standard input is a terminal.

       -Idir  Adds the specified directory to the  list	 of  directories  that
	      searches	for source files.  Normally, searches for source files
	      in the current directory and in the directory where  objfile  is
	      located.	 You  can  also issue the command to set the directory
	      search path.

       -k     Maps memory addresses. This option is useful for	kernel	debug‐

       -r     Executes	objfile immediately.  If the program executes success‐
	      fully, exits. If program execution  terminates  with  an	error,
	      displays	the  message  that  describes  the error. You can then
	      either invoke the debugger or let the program continue  exiting.
	      The debugger reads from when you specify the -r option and stan‐
	      dard input is not a terminal.

   Execution and Tracing Commands
       Using commands, you can execute	your  program  under  control  of  the
       debugger.  You can trace its execution and control whether your program
       traps certain signals. The following list describes the	commands  that
       allow you to execute and trace your program:

       call procedure[(parameters)]
	      Executes	the object code associated with the named procedure or
	      function and passes any parameters you specify to the procedure.

       catch integer
       catch signal-name
       ignore integer
       ignore signal-name
	      Starts or stops trapping a signal before it is sent to the  pro‐
	      gram.   These  commands are useful when you are debugging a pro‐
	      gram that handles signals, such as interrupts.

	      You can specify a signal by number or by a  name	(for  example,
	      SIGINT).	 Signal	 names are case insensitive and the SIG prefix
	      is optional.  By default,	 traps	all  signals  except  SIGCONT,

       cont [integer]
       cont [signal-name]
	      Continues	 execution  from  where	 it stopped.  If you specify a
	      signal name or  number,  the  process  continues	as  though  it
	      received	the  signal.   If  you omit the signal name or number,
	      program execution continues as if a signal had not been  encoun‐
	      tered. For information about signal names and numbers, see

	      Execution	 cannot	 be  continued	if  the process has called the
	      standard exit  procedure.	  The  debugger	 does  not  allow  the
	      process to exit, so you can examine the program state.

       delete command-number ...
       delete all
	      Removes  the  trace or stop event that corresponds to the speci‐
	      fied number or removes all traces and  stops.   Trace  and  stop
	      event  numbers  are  assigned  by You can display them using the
	      status command.

	      The command delete all removes all existing traces and stops  at
	      once. The command delete * has the same effect.

       next   Executes	to  the	 next  source line. If the source line that is
	      executed contains a call to a procedure or  function,  the  next
	      command  executes the entire procedure or function. Program exe‐
	      cution stops following the return from the procedure;  that  is,
	      execution stops prior to the source line that follows the call.

       reread Reads  the  object  file before beginning program execution. The
	      debugger reads the object file  directly	before	executing  the
	      program  in  response  to	 a  run	 or rerun command. Reading the
	      object file directly before executing the program	 ensures  that
	      the  execution  is  unaffected by any corruption that might have
	      occurred during a previous run.

       return [procedure]
	      Executes until a return to procedure is executed	or  until  the
	      current procedure returns if none is specified.

       run [args] [< filename] [> filename]
       rerun [args] [< filename] [> filename]
	      Starts  executing	 objfile,  passing  args as command line argu‐
	      ments.  You can use angle brackets (< or >) to redirect input or
	      output  in  the  usual  manner.	If you issue the rerun command
	      without any arguments, passes the previous argument list to  the
	      program.	 Otherwise, the rerun command is identical to run.  If
	      you recompiled your program since the last  time	read  symbolic
	      information, it reads in the new information.

       status [> filename]
	      Displays the currently active trace and stop events.

       step   Executes	one source line. If the source line contains a call to
	      a procedure or function, the step command	 stops	at  the	 first
	      line of the procedure or function.

       stop if condition
       stop at source-line-number [if condition]
       stop in procedure/function [if condition]
       stop variable [if condition]
	      Stops execution when the specified condition is true, the speci‐
	      fied line number is reached, the specified procedure or function
	      is called, or the specified variable changes value.

	      If  you  specify a condition with the source-line-number, proce‐
	      dure/function, or variable argument, execution stops  only  when
	      the  condition  is true. For example, suppose you specified that
	      execution should stop at line 14 if variable  a  is  greater  in
	      value than variable b. The debugger continues execution if vari‐
	      able a equals variable b when it reaches line 14.

       trace [in procedure/function] [if condition]
       trace source-line-number [if condition]
       trace procedure/function [in procedure/function] [if condition]
       trace expression at source-line-number [if condition]
       trace variable [in procedure/function] [if condition]
	      Displays tracing	information  during  program  execution.   The
	      debugger	associates a number with the source line that contains
	      the trace. You use the number to turn off tracing, as  described
	      with the delete command.

	      The  first argument to the trace command describes what is to be
	      traced. You can specify a procedure or function name,  a	source
	      line number, an expression, or a variable name.

	      Specifying  a  procedure	or function name causes to display the
	      name of the calling routine, the source line that	 contains  the
	      call,  and the parameters that are passed to the called routine.
	      In addition, notes the return of the named procedure or function
	      and  displays  the  return value, if any.	 The debugger displays
	      this information each time the procedure or function is called.

	      If you specify the in procedure/function clause, displays	 trac‐
	      ing  information only while executing the specified procedure or

	      If you specify  source-line-number,  displays  the  source  line
	      immediately  prior  to  executing	 it.  You can specify a source
	      line number in a source file that is not the current one. To  do
	      so,  precede the source line number with the source file name in
	      quotation marks, as shown:
	      (dbx) trace "source_file.c":17
	      The example specifies tracing line 17 in

	      If you specify an expression at a source line  number,  displays
	      the value of the expression when it executes the source line.

	      Specifying  a variable name causes to display the name and value
	      of the variable each time it changes.  Program execution is sub‐
	      stantially slower during this form of tracing.

	      The  condition  argument	is a Boolean expression that evaluates
	      prior to displaying any tracing information; if the condition is
	      false, does not display the information.

	      If  you  omit  the arguments to the trace command, displays each
	      source line before executing it.	Program execution is  substan‐
	      tially slower during this form of tracing.

   Printing Variables and Expressions
       The  debugger  allows  you to display the value of your program's vari‐
       ables  and  expressions.	  This	section	 describes  how	 the  debugger
       resolves ambiguous names, how you specify expressions, and the commands
       that you use to display the value of variables and expressions.

       The debugger resolves names by first searching  for  the	 name  in  the
       static  scope  of  the  current	procedure  or function.	 If no name is
       defined in the static scope, the debugger searches the  dynamic	scope.
       If  neither  scope yields a defined name, the debugger chooses an arbi‐
       trary symbol and displays the following message:
       [using qualified.name]
       The debugger substitutes the qualified name of the arbitrary symbol for
       qualified.name in the message.

       You  can	 override this name resolution procedure by qualifying identi‐
       fiers with a block name, as in module.variable.	For  the  C  language,
       the  debugger  treats  a source file as a module named for the filename
       without the suffix.

       You specify expressions using the C or Pascal syntax  for  expressions.
       The  debugger  supports a subset of the expression syntax for both lan‐
       guages; that is, the  debugger  supports	 the  syntax  that  is	common
       between the two languages.

       In  some cases, the debugger supports the syntax of either C or Pascal.
       For example, you can denote indirection using either an asterisk (*) as
       a prefix or a circumflex (^) as a suffix.  You can use the field refer‐
       ence operator (.) with pointers as well as records or structures,  mak‐
       ing  the	 C  operator  (->)  unnecessary (although it is supported). To
       specify a hexadecimal value, precede the value with  the	 "0x"  charac‐

       You must enclose array expressions in brackets ([ ]).

       The  debugger  checks the type of each expression; you can override the
       type of an expression by using (expression)\type-name.

       You can also specify a register name in an expression.  You denote reg‐
       isters by $rN where N is the number of the register.  You denote vector
       registers as follows:

       $vN[K] Denotes a vector data register where N is	 the  register	number
	      and  K  is an index. The debugger treats each data register as a
	      double-precision floating point array of	64  elements,  indexed
	      from 0 to 63.

       $vaer  Denotes  the vector arithmetic error register, which treats as a

       $vcr   Denotes the longword vector count register.

       $vlr   Denotes the longword vector length register

       $vmr   Denotes the vector mask register. The debugger treats  the  $vmr
	      as a Boolean array of 64 elements, indexed from 0 to 63.

       For more information about VAX registers, see the VAX Architecture Man‐

       The following list describes the debugger commands for  printing	 vari‐
       ables and expressions:

       assign variable = expression
       assign vector-register = "value [,value]"
	      Assigns  the  value  of the expression to the variable or stores
	      the specified value in the specified vector register.

	      The assign command allows you to assign a value to  one  element
	      of  a  vector  register. (You cannot use the command to assign a
	      value to a nonvector register.) You can change only one  element
	      in a register in a single command. If you omit the second value,
	      decodes the first value into the first half of the register.  If
	      you  specify  both  values, the debugger decodes the first value
	      into the first half of the register and the  second  value  into
	      the second half of the register.

	      The  value  can  be  an  integer, floating point, or hexadecimal

       dump [procedure] [> filename]
	      Displays the names and values of variables in the	 given	proce‐
	      dure  or	the  current one if none is specified.	If you specify
	      the dot (.), the debugger prints the values of all active	 vari‐

       print expression [, expression ...]
	      Displays the values of the specified expressions.

       whatis name
	      Displays	the declaration of the given name, which you can qual‐
	      ify using a block name.

       up [count]
       down [count]
	      Moves the current procedure  or  function,  which	 is  used  for
	      resolving names, up or down the stack count levels.  The default
	      for count is 1.

       where  Displays a list of the active procedures and functions.

       whereis identifier
	      Displays the full qualification of all the  symbols  whose  name
	      matches  the  given identifier.  The order in which displays the
	      symbols is not meaningful.

       which identifier
	      Displays the full qualification of the  given  identifier;  that
	      is,  display the outer blocks that are associated with the iden‐

   Accessing Source Files
       You can use the following commands to  access  source  files  during  a
       debugging session:

       /regular expression[/]
       ?regular expression[?]
	      Searches	forward or backward in the current source file for the
	      given pattern. For information on specifying a  regular  expres‐
	      sion, see The Big Gray Book: The Next Step with ULTRIX.

       cd [dirname]
	      Changes  the  current directory to the directory you specify. If
	      you omit the dirname argument, uses the directory	 specified  in
	      the HOME environment variable as the current directory.

       edit [filename]
       edit procedure/function
	      Invokes an editor on filename or the current source file if none
	      is specified.  If you specify a procedure or function name,  the
	      editor  reads  in the file that contains that procedure or func‐
	      tion.  Which editor is invoked by default depends on the instal‐
	      lation.	You  can override the default setting by modifying the
	      EDITOR environment variable.

       file [filename]
	      Changes the current source file name to filename.	 If  you  omit
	      filename, displays the name of the current source file.

       func [procedure/function]
	      Changes  the  current procedure or function.  If you omit proce‐
	      dure/function,  displays	the  current  procedure	 or  function.
	      Changing	the  current  procedure or function implicitly changes
	      the current source file to the one that contains	the  procedure
	      or  function;  it	 also  changes the current scope used for name

       list [source-line-number [, source-line-number]]
       list [source-line-number : integer]
       list [procedure/function]
	      Lists the lines in the current source file from the  first  line
	      number you specify to the second one you specify, inclusive.  If
	      you omit the second source-line-number argument, begins  at  the
	      first  line  number  and displays the next 10 lines. If you omit
	      both arguments, begins the display at the	 current  source  line
	      and displays 10 lines.

	      If  you  specify	a source line number, a colon, and an integer,
	      lists lines in the current source	 file  starting	 from  source-
	      line-number and continuing for integer number of lines.

	      If you specify the name of a procedure or function, lines n-k to
	      n+k are listed, where n is the first statement in the  procedure
	      or  function  and	 k  is	equal to the $listwindow variable. The
	      default value of $listwindow is 10.

       pwd    Displays the pathname of the current directory.

       use pathname pathname...
	      Sets the list of directories  that  searches  when  looking  for
	      source files. You can specify either a full or relative pathname
	      for pathname.

   Command Aliases and Variables
       The debugger allows you to define aliases and  set  variables  to  make
       your  debugging	sessions  more efficient. The following list describes
       the commands you use to perform these tasks:

       alias name command
       alias name [(parameters)] string
	      Lists existing aliases or defines an alias for a	command	 or  a
	      string. Specify the alias name in the name argument and the com‐
	      mand or string in the command or string argument. You can define
	      an  alias	 that  accepts parameters by specifying the parameters
	      argument.	 For example, to define an alias rr  for  the  command
	      rerun, enter the following command:
	      (dbx) alias rr rerun
	      To  define  halt	as  an	alias that sets a stop at a particular
	      line, issue the following command:
	      (dbx) alias halt(x) "stop at x"
	      Once you issue this command, interprets the  following  commands
	      as equivalent:
	      (dbx) halt(12)
	      (dbx) stop at 12
	      Both commands create a stop event at line 12.

       getenv name
	      Displays the value of the environment variable, name.

       setenv name value
	      Sets  the	 environment  variable	name  to value by changing the
	      value of an existing environment variable or creating a new one.

       set [name [= expression]]
	      Lists existing debugger variables and their values or defines  a
	      value for the named variable.

	      Some  debugger  variables contain either a zero or nonzero value
	      that controls behavior. For  example,  when  set	to  a  nonzero
	      value,  the  $hexstrings variable causes the debugger to display
	      all strings in hexadecimal format. When set to zero,  the	 vari‐
	      able causes the debugger to display strings in character format.
	      You can set a  variable  like  the  $hexstrings  variable	 to  a
	      nonzero value as shown:
	      (dbx) set $hexstrings
	      You can disable the variable using the unset command, as shown:
	      (dbx) unset $hexstrings

	      You  can use the set command to create variables using a name of
	      your own. Variables you create must not begin with a dollar sign
	      ($),  and	 the name of the variable must not conflict with names
	      in the program you are debugging. When you  create  a  variable,
	      the  set	command	 treats expression as an address and creates a
	      variable at the specified address. You can use the variable name
	      in trace and stop commands to control program execution.

	      The following list describes the debugger variables:

	      $frame If	 you  set  this variable to an address, uses the stack
		     frame at that address for stack traces and for  accessing
		     local  variables.	 This  variable is particularly useful
		     for kernel debugging.

		     You can set these variables to cause to display character
		     strings,  integers,  offsets from registers, or character
		     pointers, respectively, in hexadecimal format.

		     The value of this variable determines the number of  com‐
		     mands  stores  in the history list.  By default, the his‐
		     tory list contains 20 commands.

		     The value of this variable determines the number of lines
		     lists around a procedure or function or displays when you
		     issue the list command without  arguments.	  The  default
		     value for this variable is 10.

		     Setting  (unsetting) this variable causes to start (stop)
		     mapping addresses.	 This variable is  useful  for	kernel

		     If	 you  set  one	of  these  variables, does not perform
		     strict type checking.  When the $unsafecall  variable  is
		     set,  strict type checking is turned off for arguments to
		     procedure or function calls (for  example,	 in  the  call
		     command).	When the $unsafeassign variable is set, strict
		     type checking between the two sides of an assign  command
		     is	 turned	 off.	Use these variables with care, because
		     they severely limit the debugger's usefulness for detect‐
		     ing errors.

       unalias name
		 Removes the alias with the specified name.

       unset name
		 Deletes  the  debugger	 variable associated with the name you

   Vector Environment Commands
       The debugger provides some special commands that you can use to debug a
       program that uses vectors. The following list explains these commands:

       callv procedure/function[(parameters)]
	      Executes	the object code associated with the named procedure or
	      function.	 The callv command causes to save the vector  environ‐
	      ment before it executes the procedure. The debugger restores the
	      vector environment after the procedure exits.

       fmask[/"hex constant"] vector_register
       tmask[/"hex constant"] vector_register
	      Displays the contents of	the  specified	vector	data  register
	      using  the  vector  mask register ($vmr) or the hexadecimal con‐
	      stant you specify as a mask value. Replace vector_register  with
	      the  name of a vector register to specify which vector data reg‐
	      ister the debugger displays.

	      The fmask command causes the debugger to apply a false  mask  to
	      the  register  value.  The  tmask command causes the debugger to
	      apply a true mask to the register value.

       nextv  Executes to the next vector instruction at the current or higher
	      procedure	 level.	 The  debugger	ignores vector instructions at
	      lower procedure levels when executing this command. Thus, execu‐
	      tion  continues  through lower level procedures, but stops prior
	      to the next instruction  at  the	current	 or  higher  procedure

       stepv  Executes	the next vector instruction. The debugger stops execu‐
	      tion prior to the next vector instruction regardless of the pro‐
	      cedure level of that instruction.

   Machine Level Commands
       You  can use machine level commands to debug any program, regardless of
       whether the program object file contains extended symbol table informa‐

       You can specify symbolic addresses by preceding the name with an amper‐
       sand (&).  You denote registers by $rN where N is  the  number  of  the
       register.  You  denote vector registers by $vN where N is the number of
       the register.  Addresses may be expressions made up of other  addresses
       and the operators plus (+), minus (-), and indirection (unary asterisk,

       The following describes the machine level commands:

       address , address/ [mode]
       address / [count] [mode]
       at source-line-number / [count] [mode]
	      Display the contents of memory starting at the first address and
	      continuing up to the second address.

	      The  second form causes to display the contents of memory start‐
	      ing at address and continuing until count items  are  displayed.
	      If  you type a period (.) in the address field, uses the address
	      following the one it most recently displayed.

	      If you specify at source-line-number, displays the  contents  of
	      memory associated with the specified source line.	 You can spec‐
	      ify how many items the debugger displays using the  count	 argu‐

	      The  mode	 on  each format specifies how displays memory; if you
	      omit it, the debugger uses the previous mode.  The initial  mode
	      is X.

	      You can specify the following modes:

	      b	   Displays a byte in octal
	      c	   Displays a byte as a character
	      d	   Displays a short word in decimal
	      D	   Displays a long word in decimal
	      f	   Displays a single precision real number
	      g	   Displays a double precision real number
	      i	   Displays the machine instruction
	      o	   Displays a short word in octal
	      O	   Displays a long word in octal
	      s	   Displays a string of characters terminated by a null byte
	      x	   Displays a short word in hexadecimal
	      X	   Displays a long word in hexadecimal

       nexti  Executes	to  the	 next  machine	instruction.  If  the  machine
	      instruction that executes contains a  call  to  a	 procedure  or
	      function,	 the  debugger	executes the entire procedure or func‐
	      tion. Program execution stops following the return from the pro‐
	      cedure;  that  is,  execution  stops  prior  to execution of the
	      machine instruction that follows the call.

       stepi  Executes one machine instruction.	 If  the  machine  instruction
	      contains	a  call to a procedure or function, the debugger stops
	      at the first line of the procedure or function.

       stopi [at] [address] [if condition]
	      Stops at the specified machine address  or  when	the  specified
	      condition is met. If you specify both address and condition, the
	      debugger stops at the specified address only when the  specified
	      condition is true.

       tracei [address] [if condition]
       tracei [variable] [at address] [if condition]
	      Displays tracing information during program execution. The first
	      argument specifies an address at which  tracing  begins  or  the
	      name of a variable to trace.

	      If  you  specify	tracing a variable at a specific address, dis‐
	      plays the value of that variable when it reaches the address you

	      The  condition  argument	is a Boolean expression that evaluates
	      prior to displaying any tracing information. If the condition is
	      false, does not display the information.

   Miscellaneous Commands
       Use the following to get help about exit from the debugger, issue shell
       commands, and read commands from a file:

	      Executes a command from the history list. You  can  specify  the
	      command  name in the string argument. If you specify an integer,
	      executes the command having that number in the history list. For
	      example, the following executes the third command in the history
	      dbx> !3
	      The debugger echoes the command before execution.

       help   Displays a synopsis of commands.

	      Displays a list of the previous commands you issued. By default,
	      displays	the previous 20 commands. You can change the number of
	      commands keeps in the history list by modifying the $historywin‐
	      dow  debugger  variable.	(For  information on changing debugger
	      variables, see Command Aliases And Variables.)

       printf format, arg1, arg2,...
	      Formats a complex structure for display as  specified.  You  use
	      the  same	 format characters for this command as for the subrou‐
	      tine. For information on specifying the format, see

       quit   Exits from

       record input [filename]
	      Records all commands you	enter  at  the	prompt.	 The  debugger
	      stores  the  commands  in the specified file. You can replay the
	      commands by naming the file on the source command line.

	      If you omit  filename,  the  debugger  terminates	 the  existing
	      recording	 session. If recording is not active, ignores the com‐

       sh command-line
	      Passes the command line to the shell for execution.   The	 SHELL
	      environment variable determines which shell is used.

       source filename
	      Reads commands from the specified file.

       If  you	have  a program consisting of several object files and each is
       built from source files that include header files, the symbolic	infor‐
       mation  for  the	 header	 files is reproduced in each object code file.
       Since one debugger startup usually is done for each  link,  having  the
       linker  reorganize  the	symbol	information  will  not save much time,
       although it will reduce some of the disk space used.

       This problem results from the unrestricted semantics of	statements  in
       C.   For	 example, an include file can contain static declarations that
       are separate entities for each file in which  they  are	included.   If
       your  image  is	too  large for to run, compile with the -g option only
       those files that you are interested in debugging.  However,  even  with
       Modula-2, there is a substantial amount of duplication of symbol infor‐
       mation necessary for inter-module type checking.

       The following restrictions apply to debugging FORTRAN programs:

       ·   Inability to assign values to logical*2, complex, and  double  com‐
	   plex variables.

       ·   Inability  to represent parameter constants that are not type inte‐
	   ger or real.

       ·   Peculiar representations of the values of dummy  procedures.	  (The
	   value  shown	 for a dummy procedure is actually the first few bytes
	   of the procedure text.  To find the location of the procedure,  use
	   an ampersand (&) to use the address of the variable.)

       The  debugger does not allow you to run a program you do not own unless
       you are root.  If you are not root, the following message might be dis‐
       played on your screen when you issue the command:
       This  message  is  displayed when the debugger tries to set breakpoints
       because of restrictions on the system call.  The debugger always	 tries
       set  a breakpoint on exit. If you repeat the command, your program runs
       without breakpoints.

       The printf debugger command does not support the conversion  specifica‐

       If  you press Ctrl/C while inside the system call, a breakpoint is set.
       When the command is entered, tries to continue from the breakpoint  set
       in for which it does not have source. This causes an error condition.

       An  error  condition occurs when the command is used to print variables
       with reserved words embedded in	them.	For  example,  printing	 fails
       because "in" is a reserved word.

       When  debugging programs that contain variables beginning with the sym‐
       bol becomes confused between register variables	that  begin  with  the
       symbol and the variables defined in the C program.

       The command reports a trace message for an event set using the command.

       The command allows debugging of system files such as

       When the command is applied against a pascal program, ignores the trace
       even though a command displays a trace point has been set.

       The current version of is not able  to  perform	a  (change  directory)
       function from within.

       Object file

       Initialization file

See Also
       cc(1), pc(1), ptrace(2), vcc(1), signal(3), printf(3s)

				      VAX				dbx(1)

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