Provided by: foot_1.11.0-2_amd64 
NAME
foot - Wayland terminal emulator
SYNOPSIS
foot [OPTIONS]
foot [OPTIONS] <command> [COMMAND OPTIONS]
All trailing (non-option) arguments are treated as a command, and its arguments, to
execute (instead of the default shell).
DESCRIPTION
foot is a Wayland terminal emulator. Running it without arguments will start a new
terminal window with your default shell.
You can override the default shell by appending a custom command to the foot command line
foot sh -c "echo hello world && sleep 5"
OPTIONS
-c,--config=PATH
Path to configuration file. Default: $XDG_CONFIG_HOME/foot/foot.ini.
-C,--check-config
Verify configuration and then exit with 0 if ok, otherwise exit with 230 (see EXIT
STATUS).
-o,--override=[SECTION.]KEY=VALUE
Override an option set in the configuration file. If SECTION is not given, defaults to
main.
-f,--font=FONT
Comma separated list of fonts to use, in fontconfig format (see FONT FORMAT).
The first font is the primary font. The remaining fonts are fallback fonts that will
be used whenever a glyph cannot be found in the primary font.
The fallback fonts are searched in the order they appear. If a glyph cannot be found
in any of the fallback fonts, the dynamic fallback list from fontconfig (for the
primary font) is searched.
Default: monospace.
-w,--window-size-pixels=WIDTHxHEIGHT
Set initial window width and height, in pixels. Default: 700x500.
-W,--window-size-chars=WIDTHxHEIGHT
Set initial window width and height, in characters. Default: not set.
-t,--term=TERM
Value to set the environment variable TERM to (see TERMINFO and ENVIRONMENT). Default:
foot.
-T,--title=TITLE
Initial window title. Default: foot.
-a,--app-id=ID
Value to set the app-id property on the Wayland window to. Default: foot.
-m,--maximized
Start in maximized mode. If both --maximized and --fullscreen are specified, the last
one takes precedence.
-F,--fullscreen
Start in fullscreen mode. If both --maximized and --fullscreen are specified, the last
one takes precedence.
-L,--login-shell
Start a login shell, by prepending a '-' to argv[0].
-D,--working-directory=DIR
Initial working directory for the client application. Default: CWD of foot.
-s,--server[=PATH]
Run as a server. In this mode, a single foot instance hosts multiple terminals
(windows). Use footclient(1) to launch new terminals.
This saves some memory since for example fonts and glyph caches can be shared between
the terminals.
It also saves upstart time since the config has already been loaded and parsed, and
most importantly, fonts have already been loaded (and their glyph caches are likely to
already have been populated).
Each terminal will have its own rendering threads, but all Wayland communication, as
well as input/output to the shell, is multiplexed in the main thread. Thus, this mode
might result in slightly worse performance when multiple terminals are under heavy
load.
Also be aware that should one terminal crash, it will take all the others with it.
The default path is $XDG_RUNTIME_DIR/foot-$WAYLAND_DISPLAY.sock.
If $XDG_RUNTIME_DIR is not set, the default path is instead /tmp/foot.sock.
If $XDG_RUNTIME_DIR is set, but $WAYLAND_DISPLAY is not, the default path is
$XDG_RUNTIME_DIR/foot.sock.
Note that if you change the default, you will also need to use the --server-socket
option in footclient(1) and point it to your custom socket path.
-H,--hold
Remain open after child process exits.
-p,--print-pid=FILE|FD
Print PID to this file, or FD, when successfully started. The file (or FD) is closed
immediately after writing the PID. When a FILE as been specified, the file is unlinked
at exit.
This option can only be used in combination with -s,--server.
-d,--log-level={info,warning,error,none}
Log level, used both for log output on stderr as well as syslog. Default: info.
-l,--log-colorize=[{never,always,auto}]
Enables or disables colorization of log output on stderr. Default: auto.
-S,--log-no-syslog
Disables syslog logging. Logging is only done on stderr. This option can only be used
in combination with -s,--server.
-v,--version
Show the version number and quit.
-e
Ignored; for compatibility with xterm -e.
This option was added in response to several program launchers passing -e to arbitrary
terminals, under the assumption that they all implement the same semantics for it as
xterm(1). Ignoring it allows foot to be invoked as e.g. foot -e man foot with the same
results as with xterm, instead of producing an "invalid option" error.
EXIT STATUS
Foot will exit with code 230 if there is a failure in foot itself.
In all other cases, the exit code is that of the client application (i.e. the shell).
KEYBOARD SHORTCUTS
The following keyboard shortcuts are available by default. They can be changed in
foot.ini(5). There are also more actions (disabled by default) available; see foot.ini(5).
NORMAL MODE
shift+page up/page down
Scroll up/down in history
ctrl+shift+c, XF86Copy
Copy selected text to the clipboard
ctrl+shift+v, XF86Paste
Paste from clipboard
shift+insert
Paste from the primary selection.
ctrl+shift+r
Start a scrollback search
ctrl++, ctrl+=
Increase font size by 1pt
ctrl+-
Decrease font size by 1pt
ctrl+0
Reset font size
ctrl+shift+n
Spawn a new terminal. If the shell has been configured to emit the OSC 7 escape
sequence, the new terminal will start in the current working directory.
ctrl+shift+u
Activate URL mode, allowing you to "launch" URLs.
SCROLLBACK SEARCH
ctrl+r
Search backward for the next match. If the search string is empty, the last searched-
for string is used.
ctrl+s
Search forward for the next match. If the search string is empty, the last searched-
for string is used.
ctrl+w
Extend current selection (and thus the search criteria) to the end of the word, or the
next word if currently at a word separating character.
ctrl+shift+w
Same as ctrl+w, except that the only word separating characters are whitespace
characters.
ctrl+v, ctrl+y
Paste from clipboard into the search buffer.
shift+insert
Paste from primary selection into the search buffer.
escape, ctrl+g, ctrl+c
Cancel the search
return
Finish the search and copy the current match to the primary selection. The terminal
selection is kept, allowing you to press ctrl+shift+c to copy it to the clipboard.
URL MODE
t
Toggle URL visibility in jump label.
escape, ctrl+g, ctrl+c, ctrl+d
Exit URL mode without launching an URL.
MOUSE SHORTCUTS
left, single-click
Drag to select; when released, the selected text is copied to the primary selection.
This feature is normally disabled whenever the client has enabled mouse tracking, but
can be forced by holding shift.
Holding ctrl will create a block selection.
left, double-click
Selects the word (separated by spaces, period, comma, parenthesis etc) under the
pointer. Hold ctrl to select everything under the pointer up to, and until, the next
space characters.
left, triple-click
Selects the entire row
middle
Paste from the primary selection
right
Extend current selection. Clicking immediately extends the selection, while hold-and-
drag allows you to interactively resize the selection.
wheel
Scroll up/down in history
FONT FORMAT
The font is specified in FontConfig syntax. That is, a colon-separated list of font name
and font options.
Examples:
• Dina:weight=bold:slant=italic
• Courier New:size=12
URLs
Foot supports URL detection. But, unlike many other terminal emulators, where URLs are
highlighted when they are hovered and opened by clicking on them, foot uses a keyboard
driven approach.
Pressing ctrl+shift+u enters “URL mode”, where all currently visible URLs are underlined,
and is associated with a “jump-label”. The jump-label indicates the key sequence (e.g.
”AF”) to use to activate the URL.
The key binding can, of course, be customized, like all other key bindings in foot. See
show-urls-launch and show-urls-copy in foot.ini(5).
show-urls-launch by default opens the URL with xdg-open. This can be changed with the url-
launch option.
show-urls-copy is an alternative to show-urls-launch, that changes what activating an URL
does; instead of opening it, it copies it to the clipboard. It is unbound by default.
Jump label colors, the URL underline color, and the letters used in the jump label key
sequences can be configured.
ALT/META CHARACTERS
By default, foot prefixes meta characters with ESC. This corresponds to XTerm's
metaSendsEscape option set to true.
This can be disabled programmatically with E[?1036l (and enabled again with E[?1036h).
When disabled, foot will instead set the 8:th bit of meta character and then UTF-8 encode
it. This corresponds to XTerm's eightBitMeta option set to true.
This can also be disabled programmatically with rmm (Reset Meta Mode, E[?1034l), and
enabled again with smm (Set Meta Mode, E[?1034h).
BACKSPACE
Foot transmits DEL (^?) on backspace. This corresponds to XTerm's backarrowKey option set
to false, and to DECBKM being reset.
To instead transmit BS (^H), press ctrl+backspace.
Note that foot does not implement DECBKM, and that the behavior described above cannot be
changed.
Finally, pressing alt will prefix the transmitted byte with ESC.
KEYPAD
By default, Num Lock overrides the run-time configuration keypad mode; when active, the
keypad is always considered to be in numerical mode. This corresponds to XTerm's numLock
option set to true.
In this mode, the keypad keys always sends either numbers (Num Lock is active) or cursor
movement keys (up, down, left, right, page up, page down etc).
This can be disabled programmatically with E[?1035l (and enabled again with E[?1035h).
When disabled, the keypad sends custom escape sequences instead of numbers, when in
application mode.
CONFIGURATION
See foot.ini(5)
TERMINFO
Client applications use the terminfo identifier specified by the environment variable TERM
(set by foot) to determine terminal capabilities.
Foot has two terminfo definitions: foot and foot-direct, with foot being the default.
The difference between the two is in the number of colors they describe; foot describes
256 colors and foot-direct 16.7 million colors (24-bit truecolor).
Note that using the foot terminfo does not limit the number of usable colors to 256;
applications can still use 24-bit RGB colors. In fact, most applications work best with
foot (including 24-bit colors)). Using *-direct terminfo entries has been known to crash
some ncurses applications even.
There are however applications that need a *-direct terminfo entry for 24-bit support.
Emacs is one such example.
While using either foot or foot-direct is strongly recommended, it is possible to use e.g.
xterm-256color as well. This can be useful when remoting to a system where foot's terminfo
entries cannot easily be installed.
Note that terminfo entries can be installed in the user's home directory. I.e. if you do
not have root access, or if there is no distro package for foot's terminfo entries, you
can install foot's terminfo entries manually, by copying foot and foot-direct to
~/.terminfo/f/.
XTGETTCAP
XTGETTCAP is an escape sequence initially introduced by XTerm, and also implemented (and
extended, to some degree) by Kitty.
It allows querying the terminal for terminfo classic, file-based, terminfo definition. For
example, if all applications used this feature, you would no longer have to install foot’s
terminfo on remote hosts you SSH into.
XTerm’s implementation (as of XTerm-370) only supports querying key (as in keyboard keys)
capabilities, and three custom capabilities:
• TN - terminal name
• Co - number of colors (alias for the colors capability)
• RGB - number of bits per color channel (different semantics from the RGB capability in
file-based terminfo definitions!).
Kitty has extended this, and also supports querying all integer and string capabilities.
Foot supports this, and extends it even further, to also include boolean capabilities.
This means foot’s entire terminfo can be queried via XTGETTCAP.
Note that both Kitty and foot handles responses to multi-capability queries slightly
differently, compared to XTerm.
XTerm will send a single DCS reply, with ;-separated capability/value pairs. There are a
couple of issues with this:
• The success/fail flag in the beginning of the response is always 1 (success), unless
the very first queried capability is invalid.
• XTerm will not respond at all to an invalid capability, unless it’s the first one in
the XTGETTCAP query.
• XTerm will end the response at the first invalid capability.
In other words, if you send a large multi-capability query, you will only get responses up
to, but not including, the first invalid capability. All subsequent capabilities will be
dropped.
Kitty and foot on the other hand, send one DCS response for each capability in the multi
query. This allows us to send a proper success/fail flag for each queried capability.
Responses for all queried capabilities are always sent. No queries are ever dropped.
ENVIRONMENT
The following environment variables are used by foot:
SHELL
The default child process to run, when no command argument is specified and the shell
option in foot.ini(5) is not set.
XDG_CONFIG_HOME
Used to determine the default location of foot.ini(5).
XDG_CONFIG_DIRS
Used to determine the default fallback location of foot.ini(5), when not found in
${XDG_CONFIG_HOME:-~/.config}.
XDG_RUNTIME_DIR
Used to construct the default PATH for the --server option, when no explicit argument
is given (see above).
WAYLAND_DISPLAY
Used to construct the default PATH for the --server option, when no explicit argument
is given (see above).
XCURSOR_THEME
The name of the Xcursor(3) theme to use for pointers (typically set by the Wayland
compositor).
XCURSOR_SIZE
The size to use for Xcursor(3) pointers (typically set by the Wayland compositor).
The following environment variables are set in the child process:
TERM
terminfo/termcap identifier. This is used by client applications to determine which
capabilities a terminal supports. The value is set according to either the --term
command-line option or the term config option in foot.ini(5).
COLORTERM
This variable is set to truecolor, to indicate to client applications that 24-bit RGB
colors are supported.
BUGS
Please report bugs to https://codeberg.org/dnkl/foot/issues
Before you open a new issue, please search existing bug reports, both open and closed
ones. Chances are someone else has already reported the same issue.
The report should contain the following:
• Foot version (foot --version).
• Log output from foot (start foot from another terminal).
• Which Wayland compositor (and version) you are running.
• If reporting a crash, please try to provide a bt full backtrace with symbols.
• Steps to reproduce. The more details the better.
IRC
#foot on irc.libera.chat
SEE ALSO
foot.ini(5), footclient(1)
2022-02-21 foot(1)