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 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

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

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

       -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 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
            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-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.)

            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 above).

            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 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.

            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.

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