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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	mandatory  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   On sorted view,  select  a	field  for  sorting,  also  accessible
	    through  <	and >.	The current sort field is indicated by a high‐
	    light in the header.  On tree view, expand or collapse the current
	    subtree.  A	 "+"  indicator	 in the tree node indicates that it is
	    collapsed.

       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 its 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	 kernel's  internal priority for the process, usually just its
	    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.

       OOM  OOM killer score.

       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 <hisham@gobolinux.org>.

       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 1.0.3			     2011			       HTOP(1)
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