HTOP(1)                              Utils                             HTOP(1)

       htop - interactive process viewer

       htop [-dChusv]

       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, as well as viewing them as a process
       tree, selecting multiple processes and acting on them all at once.

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

       Mandatory  arguments  to  long  options are mandatory for short options

       -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

       The following commands are supported while in htop:

       Up, Alt-k
            Select (highlight) the  previous  process  in  the  process  list.
            Scroll the list if necessary.

       Down, Alt-j
            Select  (highlight)  the  next process in the process list. Scroll
            the list if necessary.

       Left, Alt-h
            Scroll the process list left.

       Right, Alt-l
            Scroll the process list right.

       PgUp, PgDn
            Scroll the process list up or down one window.

       Home Scroll to the top  of  the  process  list  and  select  the  first

       End  Scroll  to  the  bottom  of  the  process list and select the last

       Ctrl-A, ^
            Scroll left to the beginning of the process entry (i.e.  beginning
            of line).

       Ctrl-E, $
            Scroll right to the end of the process entry (i.e. end of line).

            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

       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

       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.)

       p    Show full paths to running programs, where applicable. (This is  a
            toggle key.)

            Refresh: redraw screen and recalculate values.

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

       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-

            The  full command line of the process (i.e. program name and argu-

       PID  The process ID.

       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

       PPID The parent process ID.

       PGRP The process's group ID.

       SESSION (SID)
            The process's session ID.

       TTY_NR (TTY)
            The controlling terminal of the process.

            The process ID of the foreground process group of the  controlling

            The number of page faults happening in the main memory.

            The  number  of minor faults for the process's waited-for children
            (see MINFLT above).

            The number of page faults happening out of the main memory.

            The number of major faults for the process's  waited-for  children
            (see MAJFLT above).

       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  sys-
            tem 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.

            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).

            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).

            The  kernel's  internal priority for the process, usually just its
            nice value plus twenty. Different for real-time processes.

       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. The  usual  OS  permission
            restrictions for adjusting priority apply.

            The time the process was started.

            The ID of the CPU the process last executed on.

       M_SIZE (VIRT)
            The size of the virtual memory of the process.

            The  resident  set size (text + data + stack) of the process (i.e.
            the size of the process's used physical memory).

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

       M_TRS (CODE)
            The text resident set size of the process (i.e. the  size  of  the
            process's executable instructions).

       M_DRS (DATA)
            The data resident set size (data + stack) of the process (i.e. the
            size of anything except the process's executable instructions).

       M_LRS (LIB)
            The library size 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.

            The percentage of the CPU  time  that  the  process  is  currently

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

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

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

       NLWP The number of threads in the process.

       TGID The thread group ID.

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

       VPID OpenVZ process ID.

       VXID VServer process ID.

       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.

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

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

            Bytes of cancelled write(2) I/O.

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

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

       IO_RATE (DISK R/W)
            The I/O rate, IO_READ_RATE + IO_WRITE_RATE (see above).

            Which cgroup the process is in.

       OOM  OOM killer score.

            The I/O scheduling class followed by the  priority  if  the  class
            supports it:
               R for Realtime
               B for Best-effort
               id for Idle

            The  percentage  of time spent waiting for a CPU (while runnable).
            Requires CAP_NET_ADMIN.

            The percentage of time spent waiting for the  completion  of  syn-
            chronous block I/O. Requires CAP_NET_ADMIN.

            The   percentage   of  time  spent  swapping  in  pages.  Requires

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

       By default htop reads its configuration  from  the  XDG-compliant  path
       ~/.config/htop/htoprc  --  the  configuration  file  is  overwritten by
       htop's in-program Setup configuration, so it should not be hand-edited.
       If no user configuration exists htop tries to read the system-wide con-
       figuration from /etc/htoprc and as a last resort,  falls  back  to  its
       hard coded defaults.

       You may override the location of the configuration file using the $HTO-
       PRC environment variable (so you can have multiple  configurations  for
       different machines that share the same home directory, for example).

       Memory  sizes  in  htop are displayed as they are in tools from the GNU
       Coreutils (when ran with the --human-readable option). This means  that
       sizes are printed in powers of 1024. (e.g., 1023M = 1072693248 Bytes)

       The  decision  to  use  this  convention  was made in order to conserve
       screen space and make memory size representations consistent throughout

       proc(5), top(1), free(1), ps(1), uptime(1), limits.conf(5)

       htop is developed by Hisham Muhammad <>.

       This  man  page  was  written  by  Bartosz Fenski <> 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 2.1.0                           2015                              HTOP(1)
Man Pages Copyright Respective Owners. Site Copyright (C) 1994 - 2022 Hurricane Electric. All Rights Reserved.