Provided by: htop_1.0.2-3_amd64 bug


       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 horizontally, 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.


       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


       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 processes, like "kill",
            will  then  apply  over  the  list  of  tagged  processes,  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, presenting a live update of system calls issued
            by the process.

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

       L    Trace process library calls: if ltrace(1) is installed, pressing this key will attach
            it to the currently selected process, presenting  a  live  update  of  library  calls
            issued by the process.

       F1, h, ?
            Go to the help screen

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

       F3, /
            Incrementally  search the command lines of all the displayed processes. 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 relations 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

       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 signal to all  tagged  processes.   If
            none is tagged, sends to the currently selected process.

       F10, q

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

       +, - 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.)

            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 system, or currently unimplemented in htop.
       The  names below are the ones used in the "Available Columns" section of the setup screen.
       If a different name is shown in htop's main screen, it is shown below in parenthesis.

            The full command line of the process (i.e program name and arguments).

       PID  The process ID.

       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 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

            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.

            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).

            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

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

            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.

            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

       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.

            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.

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

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

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

            Bytes of cancelled write(2) I/O.

            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 '-').


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


       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.