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HTOP(1)				     Utils			       HTOP(1)

NAME
       htop - interactive process viewer

SYNOPSIS
       htop [-dChusv]

DESCRIPTION
       Htop is a free (GPL) ncurses-based process viewer for Linux.

       It  is similar to top, but allows you to scroll vertically and horizon‐
       tally, so you can see all the processes running on  the	system,	 along
       with their full command lines.

       Tasks  related  to  processes  (killing,	 renicing) can be done without
       entering their PIDs.

COMMAND-LINE OPTIONS
       Mandatory arguments to long options are madatory for short options too.

       -d --delay=DELAY
	      Delay between updates, in tenths of seconds

       -C --no-color --no-colour
	      Start htop in monochrome mode

       -h --help
	      Display a help message and exit

       -p --pid=PID,PID...
	      Show only the given PIDs

       -s --sort-key COLUMN
	      Sort by this column (use --sort-key help for a column list)

       -u --user=USERNAME
	      Show only the processes of a given user

       -v --version
	      Output version information and exit

INTERACTIVE COMMANDS
       The following commands are supported while in htop:

       Arrows, PgUP, PgDn, Home, End
	    Scroll the process list.

       Space
	    Tag or untag a process. Commands that can operate on multiple pro‐
	    cesses,  like "kill", will then apply over the list of tagged pro‐
	    cesses, instead of the currently highlighted one.

       U    Untag all processes (remove all tags added with the Space key).

       s    Trace process system calls: if strace(1)  is  installed,  pressing
	    this  key  will  attach it to the currently selected process, pre‐
	    senting a live update of system calls issued by the process.

       l    Display open files for a process: if lsof(1) is installed,	press‐
	    ing	 this  key will display the list of file descriptors opened by
	    the process.

       F1, h, ?
	    Go to the help screen

       F2, S
	    Go to the setup screen, where you can configure  the  meters  dis‐
	    played  at	the  top  of  the screen, set various display options,
	    choose among color schemes, and  select  which  columns  are  dis‐
	    played, in which order.

       F3, /
	    Incrementally  search  the command lines of all the displayed pro‐
	    cesses. The currently selected (highlighted) command  will	update
	    as	you type. While in search mode, pressing F3 will cycle through
	    matching occurrences.

       F4, \
	    Incremental process filtering: type in part of a  process  command
	    line and only processes whose names match will be shown. To cancel
	    filtering, enter the Filter option again and press Esc.

       F5, t
	    Tree view: organize processes by parenthood, and layout the	 rela‐
	    tions between them as a tree. Toggling the key will switch between
	    tree and your previously selected sort view. Selecting a sort view
	    will exit tree view.

       F6, <, >
	    Select a field for sorting. The current sort field is indicated by
	    a highlight in the header.

       F7, ]
	    Increase the selected process's  priority  (subtract  from	'nice'
	    value).  This can only be done by the superuser.

       F8, [
	    Decrease the selected process's priority (add to 'nice' value)

       F9, k
	    "Kill" process: sends a signal which is selected in a menu, to one
	    or a group of processes. If processes were tagged, sends the  sig‐
	    nal to all tagged processes.  If none is tagged, sends to the cur‐
	    rently selected process.

       F10, q
	    Quit

       I    Invert the sort order: if sort  order  is  increasing,  switch  to
	    decreasing, and vice-versa.

       +, - When in tree view mode, expand or collapse subtree. When a subtree
	    is collapsed a "+" sign shows to the left of the process name.

       a (on multiprocessor machines)
	    Set CPU affinity: mark which CPUs a process is allowed to use.

       u    Show only processes owned by a specified user.

       M    Sort by memory usage (top compatibility key).

       P    Sort by processor usage (top compatibility key).

       T    Sort by time (top compatibility key).

       F    "Follow" process: if the sort order causes the currently  selected
	    process  to	 move  in  the list, make the selection bar follow it.
	    This is useful for monitoring a process: this way, you can keep  a
	    process  always  visible  on  screen. When a movement key is used,
	    "follow" loses effect.

       K    Hide kernel threads: prevent the threads belonging the  kernel  to
	    be displayed in the process list. (This is a toggle key.)

       H    Hide user threads: on systems that represent them differently than
	    ordinary processes (such as recent NPTL-based systems),  this  can
	    hide  threads  from userspace processes in the process list. (This
	    is a toggle key.)

       Ctrl-L
	    Refresh: redraw screen and recalculate values.

       Numbers
	    PID search: type in process ID and the selection highlight will be
	    moved to it.

COLUMNS
       The  following  columns can display data about each process. A value of
       '-' in all the rows indicates that a column is unsupported on your sys‐
       tem,  or	 currently unimplemented in htop. The names below are the ones
       used in the "Available Columns" section of the setup screen. If a  dif‐
       ferent name is shown in htop's main screen, it is shown below in paren‐
       thesis.

       Command
	    The full command line of the process (i.e program name  and	 argu‐
	    ments).

       PID  The process ID.

       PPID The parent process ID.

       PGRP The process's group ID.

       SESSION (SESN)
	    The process's session ID.

       TTY_NR (TTY)
	    The controlling terminal of the process.

       TPGID
	    The	 process ID of the foreground process group of the controlling
	    terminal.

       STATE (S)
	    The state of the process:
	       S for sleeping (idle)
	       R for running
	       D for disk sleep (uninterruptible)
	       Z for zombie (waiting for parent to read it's exit status)
	       T for traced or suspended (e.g by SIGTSTP)
	       W for paging

       PROCESSOR (CPU)
	    The ID of the CPU the process last executed on.

       NLWP The number of threads in the process.

       NICE (NI)
	    The nice value of a process, from 19 (low priority) to  -20	 (high
	    priority).	A  high value means the process is being nice, letting
	    others have a higher relative priority. Only root  can  lower  the
	    value.

       PERCENT_CPU (CPU%)
	    The	 percentage  of	 the  CPU  time	 that the process is currently
	    using.

       UTIME (UTIME+)
	    The user CPU time, which is the amount of  time  the  process  has
	    spent executing on the CPU in user mode (i.e everything but system
	    calls), measured in clock ticks.

       STIME (STIME+)
	    The system CPU time, which is the amount of time  the  kernel  has
	    spent executing system calls on behalf of the process, measured in
	    clock ticks.

       TIME (TIME+)
	    The time, measured in clock ticks that the process	has  spent  in
	    user and system time (see UTIME, STIME above).

       CUTIME
	    The	 children's  user  CPU	time,  which is the amount of time the
	    process's waited-for children have spent executing	in  user  mode
	    (see UTIME above).

       CSTIME
	    The	 children's  system  CPU time, which is the amount of time the
	    kernel has spent executing system  calls  on  behalf  of  all  the
	    process's waited-for children (see STIME above).

       PRIORITY (PRI)
	    The	 kernels  internal priority for the process, usually just it's
	    nice value plus twenty. Different for real-time processes.

       PERCENT_MEM
	    The percentage of memory the process is currently using (based  on
	    the process's resident memory size, see M_RESIDENT below).

       M_SIZE (VIRT)
	    Size in memory of the total program size.

       M_RESIDENT (RES)
	    The resident set size, i.e the size of the text and data sections,
	    plus stack usage.

       M_SHARE (SHR)
	    The size of the process's shared pages

       M_TRS (CODE)
	    The size of the text segment of the process (i.e the size  of  the
	    processes executable instructions).

       M_LRS (LIB)
	    The library size of the process.

       M_DRS (DATA)
	    The size of the data segment plus stack usage of the process.

       M_DT (DIRTY)
	    The size of the dirty pages of the process.

       ST_UID (UID)
	    The user ID of the process owner.

       USER The	 username  of  the  process  owner, or the user ID if the name
	    can't be determined.

       STARTTIME
	    The time the process was started.

       RCHAR (RD_CHAR)
	    The number of bytes the process has read.

       WCHAR (WR_CHAR)
	    The number of bytes the process has written.

       SYSCR (RD_SYSC)
	    The number of read(2) syscalls for the process.

       SYSCW (WR_SYSC)
	    The number of write(2) syscalls for the process.

       RBYTES (IO_RBYTES)
	    Bytes of read(2) I/O for the process.

       WBYTES (IO_WBYTES)
	    Bytes of write(2) I/O for the process.

       IO_READ_RATE (IORR)
	    The I/O rate of read(2) in bytes per second, for the process.

       IO_WRITE_RATE (IOWR)
	    The I/O rate of write(2) in bytes per second, for the process.

       IO_RATE (IO)
	    The I/O rate, IO_READ_RATE + IO_WRITE_RATE (see above).

       CNCLWB (IO_CANCEL)
	    Bytes of cancelled write(2) I/O.

       CGROUP
	    Which cgroup the process is in.

       CTID OpenVZ container ID, a.k.a virtual environment ID.

       VPID OpenVZ process ID.

       VXID VServer process ID.

       All other flags
	    Currently unsupported (always displays '-').

SEE ALSO
       proc(5), top(1), free(1), ps(1), uptime(1)

AUTHORS
       htop  is	 developed  by	 Hisham	  Muhammad   <loderunner@users.source‐
       forge.net>.

       This  man  page	was  written  by  Bartosz Fenski <fenio@o2.pl> for the
       Debian GNU/Linux distribution (but it may be used by  others).  It  was
       updated	by Hisham Muhammad, and later by Vincent Launchbury, who wrote
       the 'Columns' section.

htop 1.0.2			     2011			       HTOP(1)
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