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:

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

            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.

            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

       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 2.0.1                           2015                              HTOP(1)
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