htop

HTOP(1)                           User Commands                          HTOP(1)



NAME
       htop - interactive process viewer

SYNOPSIS
       htop [-dCFhpustvH]

DESCRIPTION
       htop is a cross-platform ncurses-based process viewer.

       It is similar to top, but allows you to scroll vertically and
       horizontally, and interact using a pointing device (mouse).  You can
       observe all processes running on the system, along with their command
       line arguments, as well as view them in a tree format, select multiple
       processes and acting on them all at once.

       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. If the delay value is
              less than 1 it is increased to 1, i.e. 1/10 second. If the delay
              value is greater than 100, it is decreased to 100, i.e. 10
              seconds.

       -C --no-color --no-colour
              Start htop in monochrome mode

       -F --filter=FILTER
              Filter processes by command

       -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).  This
              will force a list view unless you specify -t at the same time.

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

       -U --no-unicode
              Do not use unicode but ASCII characters for graph meters

       -M --no-mouse
              Disable support of mouse control

       -V --version
              Output version information and exit

       -t --tree
              Show processes in tree view. This can be used to force a tree view
              when requesting a sort order with -s.

       -H --highlight-changes=DELAY
              Highlight new and old processes

INTERACTIVE COMMANDS
       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 process.

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

       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).

       Space
            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.

       c    Tag the current process and its children. 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 or c
            keys).

       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.

       w    Display the command line of the selected process in a separate
            screen, wrapped onto multiple lines as needed.

       x    Display the active file locks of the selected process in a separate
            screen.

       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.  Pressing Shift-F3 will cycle backwards.

            Alternatively the search can be started by simply typing the command
            you are looking for, although for the first character normal key
            bindings take precedence.

       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, <, >
            Selects a field for sorting, also accessible through < and >.  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
            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.

       N    Sort by PID.

       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.)

       Z    Pause/resume process updates.

       m    Merge exe, comm and cmdline, where applicable. (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 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.

       Command
            The full command line of the process (i.e. program name and
            arguments). If the option 'Merge exe, comm and cmdline in Command'
            (toggled by the 'm' key) is set, and if readable, the executable
            path (/proc/[pid]/exe) and the command name (/proc/[pid]/comm) are
            also shown merged with the command line.

       Comm The command name of the process obtained from /proc/[pid]/comm, if
            readable.

       Exe  The abbreviated basename of the executable of the process, obtained
            from /proc/[pid]/exe, if readable. htop is able to read this file on
            linux for ALL the processes only if it has the capability
            CAP_SYS_PTRACE or root privileges.

       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.

       TPGID
            The process ID of the foreground process group of the controlling
            terminal.

       MINFLT
            The number of page faults happening in the main memory.

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

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

       CMAJFLT
            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 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.

       CUTIME (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 (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.

       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.

       STARTTIME (START)
            The time the process was started.

       PROCESSOR (CPU)
            The ID of the CPU the process last executed on.

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

       M_RESIDENT (RES)
            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.

       M_SWAP (SWAP)
            The size of the process's swapped pages.

       M_PSS (PSS)
            The proportional set size, same as M_RESIDENT but each page is
            divided by the number of processes sharing it.

       M_M_PSSWP (PSSWP)
            The proportional swap share of this mapping, unlike M_SWAP this does
            not take into account swapped out page of underlying shmem objects.

       ST_UID (UID)
            The user ID of the process owner.

       PERCENT_CPU (CPU%)
            The percentage of the CPU time that the process is currently using.

       PERCENT_MEM (MEM%)
            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.

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

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

       CNCLWB (IO_CANCEL)
            Bytes of cancelled write(2) I/O.

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

       IO_WRITE_RATE (DISK WRITE)
            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).

       CGROUP
            Which cgroup the process is in.

       OOM  OOM killer score.

       CTXT Incremental sum of voluntary and nonvoluntary context switches.

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

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

       PERCENT_IO_DELAY (IOD%)
            The percentage of time spent waiting for the completion of
            synchronous block I/O. Requires CAP_NET_ADMIN.

       PERCENT_SWAP_DELAY (SWAPD%)
            The percentage of time spent swapping in pages. Requires
            CAP_NET_ADMIN.

       COMM The command name for the process. Requires Linux kernel 2.6.33 or
            newer.

       EXE  The executable file of the process as reported by the kernel.
            Requires CAP_SYS_PTRACE and PTRACE_MODE_READ_FSCRED.

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

EXTERNAL LIBRARIES
       While htop depends on most of the libraries it uses at build time there
       are two noteworthy exceptions to this rule. These exceptions both relate
       to data displayed in meters displayed in the header of htop and were
       intentionally created as optional runtime dependencies instead.  These
       exceptions are described below:

       libsystemd
              The bindings for libsystemd are used in the SystemD meter to
              determine the number of active services and the overall system
              state. Looking for the functions to determine these information at
              runtime allows for builds to support these meters without forcing
              the package manager to install these libraries on systems that
              otherwise don't use systemd.

              Summary: no build time dependency, optional runtime dependency on
              libsystemd via dynamic loading, with systemctl(1) fallback.

       libsensors
              The bindings for libsensors are used for the CPU temperature
              readings in the CPU usage meters if displaying the temperature is
              enabled through the setup screen. In order for htop to show these
              temperatures correctly though, a proper configuration of
              libsensors through its usual configuration files is assumed and
              that all CPU cores correspond to temperature sensors from the
              coretemp driver with core 0 corresponding to a sensor labelled
              "Core 0". The package temperature may be given as "Package id 0".
              If missing it is inferred as the maximum value from the available
              per-core readings.

              Summary: build time dependency on libsensors(3) C header files,
              optional runtime dependency on libsensors(3) via dynamic loading.

CONFIG FILE
       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
       configuration 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 $HTOPRC
       environment variable (so you can have multiple configurations for
       different machines that share the same home directory, for example).

MEMORY SIZES
       Memory sizes in htop are displayed in a human-readable form.  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 htop.

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

AUTHORS
       htop was originally developed by Hisham Muhammad.  Nowadays it is
       maintained by the community at <htop@groups.io>.



htop 3.0.5                            2020                               HTOP(1)