htop - interactive process viewer
This program is a free (GPL) ncurses-based process viewer.
It is similar to top, but allows to scroll the list vertically and
horizontally to see all processes and their full command lines.
Tasks related to processes (killing, renicing) can be done without
entering their PIDs.
The following flags are supported:
- -d DELAY
- Delay between updates, in tenths of seconds
- -u USERNAME
- Show only processes of a given user
- --sort-key COLUMN
- Sort by this column (use --sort-key help for a column list)
The following commands are supported:
- Arrows, PgUP, PgDn, Home, End
- Scroll process list.
- Space
- "Tag": mark 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.
- F1, h
- Help screen
- F2, S
- Setup screen. There you can configure meters displayed on the top side of
the screen, as well as set various display options, choose among color
schemes and select the layout of the displayed columns.
- F3, /
- Incremental process search: type in part of a process command line and the
selection highlight will be moved to it. While in search mode, pressing
this key will cycle through matching occurrences.
- F4, I
- Invert sort order: if sort order is increasing, switch to decreasing, and
vice-versa.
- 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 field for sorting. The sort field is indicated by a highlight in
the header.
- F7, ], -
- Increase selected process priority (subtract from 'nice' value). This can
be done by the superuser only.
- F8, [, +
- Decrease selected process 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
- 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.)
- Ctrl-L
- Refresh: redraw screen and recalculate values.
- Numbers
- PID search: type in process ID and the selection highlight will be moved
to it.
htop is developed by Hisham Muhammad <loderunner@users.sourceforge.net>.
This man page was written by Bartosz Fenski <fenio@o2.pl> for the Debian
GNU/Linux distribution (but it may be used by others), and updated by Hisham
Muhammad.