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test(1sh5)							    test(1sh5)

Name
       test - condition evaluation command

Syntax
       test expr
       [ expr ]

Description
       The  command  evaluates	the  expression expr.  If the value of expr is
       true, the command returns a zero exit status; otherwise, it  returns  a
       nonzero exit status.  The command also returns a nonzero exit status if
       no arguments are specified.  The following primitives are used to  con‐
       struct expr:

       -r file	      True if file exists and is readable.

       -w file	      True if file exists and is writable.

       -x file	      True if file exists and is executable.

       -f file	      True if file exists and is a regular file.

       -d file	      True if file exists and is a directory.

       -c file	      True if file exists and is a character special file.

       -b file	      True if file exists and is a block special file.

       -p file	      True if file exists and is a named pipe (fifo).

       -u file	      True if file exists and its set-user-ID bit is set.

       -g file	      True if file exists and its set-group-ID bit is set.

       -k file	      True if file exists and its sticky bit is set.

       -s file	      True if file exists and has a size greater than zero.

       -t [ fildes ]  True  if	the  open file whose file descriptor number is
		      fildes (1 by default)  is	 associated  with  a  terminal
		      device.

       -z s1	      True if the length of string s1 is zero.

       -n s1	      True if the length of the string s1 is non-zero.

       s1 = s2	      True if strings s1 and s2 are identical.

       s1 != s2	      True if strings s1 and s2 are not identical.

       s1	      True if s1 is not the null string.

       n1 -eq n2      True  if the integers n1 and n2 are algebraically equal.
		      Any of the comparisons -ne, -gt, -ge, -lt, and  -le  may
		      be used in place of -eq.

       These primitives can be combined with the following operators:

       !	      unary negation operator.

       -a	      binary and operator.

       -o	      binary or operator (-a has higher precedence than -o).

       ( expr )	      parentheses for grouping.

       Note  that  all	the  operators and flags are separate arguments to the
       command.	 Note also that parentheses are meaningful to  the  Shell  and
       must  be escaped.  In the form of the command that uses square brackets
       ([]), instead of the word test,	the  brackets  must  be	 delimited  by
       blanks.

See Also
       find(1), sh5(1), test(1)

								    test(1sh5)

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