byobu version 5.106 Use: screen [-opts] [cmd [args]] or: screen -r [host.tty] Options: -4 Resolve hostnames only to IPv4 addresses. -6 Resolve hostnames only to IPv6 addresses. -a Force all capabilities into each window's termcap. -A -[r|R] Adapt all windows to the new display width & height. -c file Read configuration file instead of '.screenrc'. -d (-r) Detach the elsewhere running screen (and reattach here). -dmS name Start as daemon: Screen session in detached mode. -D (-r) Detach and logout remote (and reattach here). -D -RR Do whatever is needed to get a screen session. -e xy Change command characters. -f Flow control on, -fn = off, -fa = auto. -h lines Set the size of the scrollback history buffer. -i Interrupt output sooner when flow control is on. -l Login mode on (update /var/run/utmp), -ln = off. -ls [match] or -list Do nothing, just list our SockDir [on possible matches]. -L Turn on output logging. -m ignore $STY variable, do create a new screen session. -O Choose optimal output rather than exact vt100 emulation. -p window Preselect the named window if it exists. -q Quiet startup. Exits with non-zero return code if unsuccessful. -Q Commands will send the response to the stdout of the querying process. -r [session] Reattach to a detached screen process. -R Reattach if possible, otherwise start a new session. -s shell Shell to execute rather than $SHELL. -S sockname Name this session <pid>.sockname instead of <pid>.<tty>.<host>. -t title Set title. (window's name). -T term Use term as $TERM for windows, rather than "screen". -U Tell screen to use UTF-8 encoding. -v Print "Screen version 4.03.01 (GNU) 28-Jun-15". -wipe [match] Do nothing, just clean up SockDir [on possible matches]. -x Attach to a not detached screen. (Multi display mode). -X Execute <cmd> as a screen command in the specified session. Error: Unknown option -V

byobu(1) byobu byobu(1) NAME byobu - wrapper script for seeding a user's byobu configuration and launching a text based window manager (either screen or tmux) SYNOPSIS byobu [options] byobu-screen [screen options] byobu-tmux [tmux options] Options to byobu are simply passed through screen(1) or tmux(1). DESCRIPTION byobu is a script that launches a text based window manager (either screen(1) or tmux(1)) in the byobu configuration. This enables the display of system information and status notifications within two lines at the bottom of the screen session. It also enables multiple tabbed terminal sessions, accessible through simple keystrokes. byobu currently defaults to using tmux(1) (if present) as the backend, however, this can be overridden with the byobu-select-backend(1) util‐ ity. Note that BYOBU_CONFIG_DIR=$XDG_CONFIG_HOME/byobu if defined, and $HOME/.byobu otherwise. BACKGROUND COLORS The background colors of the byobu status lines can be adjusted by editing the files $HOME/.byobu/color (for byobu-screen) and $HOME/.byobu/color.tmux (for byobu-tmux). The command Ctrl-Shift-F5 will change the background to a randomly selected color when running in byobu-tmux mode. Simply remove those files to return to the default color configuration. STATUS NOTIFICATIONS byobu supports a number of unique and interesting status notifications across the lowest two lines in the screen. Each status notification item is independently configurable, enabled and disabled by the config‐ uration utility. The guide below helps identify each status item (in alphabetical order): apport - symbol displayed if there are pending crash reports; {!} sym‐ bol displayed on the lower bar toward the left, in black on an orange background arch - system architecture; displayed on the lower bar toward the left, in the default text color on the default background color battery - battery information; display on the lower bar toward the right; - indicates discharging, + indicates charging, = indicates fully charged; when charging or discharging, the current battery capacity as a percentage is displayed; the colours green, yellow, and red are used to give further indication of the battery's charge state; you may over‐ ride the detected battery by setting BATTERY=/proc/acpi/battery/BAT0 in $BYOBU_CONFIG_DIR/statusrc cpu_count - the number of cpu's or cores on the system; displayed in the lower bar toward the right in the default text color on the default background, followed by a trailing 'x' cpu_freq - the current frequency of the cpu in GHz; displayed in the lower bar toward the right in white text on a light blue background cpu_temp - the cpu temperature in Celsius (default) or Fahrenheit, con‐ figure TEMP=F or TEMP=C in $BYOBU_CONFIG_DIR/statusrc; displayed in the lower bar toward the right in yellow text on a black background; you may override the detected cpu temperature device by setting MONI‐ TORED_TEMP=/proc/acpi/whatever in $BYOBU_CONFIG_DIR/statusrc custom - user defined custom scripts; must be executable programs of any kind in $BYOBU_CONFIG_DIR/bin; must be named N_NAME, where N is the frequency in seconds to refresh the status indicator, and NAME is the name of the script; N should not be less than 5 seconds; the script should echo a small amount of text to standard out, standard error is discarded; the indicator will be displayed in the lower panel, in default colors, unless you manually specify the colors in your script's output; BEWARE, cpu-intensive custom scripts may impact your overall system performance and could upset your system administrator! In fact, you can easily copy and modify any status script usually found in /usr/lib/byobu/* to your local $HOME/.byobu/ directory. Example: $BYOBU_CONFIG_DIR/bin/1000_uname #!/bin/sh printf "\005{= bw}%s\005{-}" "$(uname -r)" date - the system date in YYYY-MM-DD format, or you can set this to any valid strftime(3) you like in $BYOBU_CONFIG_DIR/datetime; displayed in the lower on the far right in the default text color on the default background disk - total disk space available and total used on / directory; dis‐ played in the lower bar on the far right in white text on a light pur‐ ple background; override the default directory by specifying an alter‐ nate mount point with MONITORED_DISK=/wherever in $BYOBU_CON‐ FIG_DIR/statusrc disk_io - instantaneous read/write througput in kB/s or MB/s over the last 3 seconds; displayed in the lower bar toward the right in white text on a light purple background with a leading '<' sign indicating 'read speed' and '>' sign indicating 'write speed'; override the default monitored disk by specifying an alternate device with MONI‐ TORED_DISK=/dev/sdb, and override the default DISK_IO_THRESHOLD=50 (kB/s) in $BYOBU_CONFIG_DIR/statusrc distro - OS/distribution name of the release running on the current system as reported by lsb_release(1) or /etc/issue; displayed in the lower bar in bold black text toward the left on a grey background; you may override the detected release with DISTRO=Whatever in $BYOBU_CON‐ FIG_DIR/statusrc ec2_cost - an estimation of the cost of the current boot of the system in terms of the Amazon EC2 billing model; displayed in the lower bar toward the right in green text on a black background; the monetary units are US Dollars '$'; this plugin only works when an AWS-compatible metadata server is available at http://169.254.169.254 entropy - a count of the system's current entropy in bytes; displayed in the lower bar toward the right in yellow text on a dark grey back‐ ground; there is a leading 'e' to indicate 'entropy' raid - note very prominently if there is a RAID failure detected, in red blinking text on a white background; the term 'RAID' notes that there is something wrong with the RAID, and if there is a rebuild/resync in progress, the percent complete is also shown rcs_cost - an estimation of the cost of the current boot of the system in terms of the Rackspace Cloud Server billing model; displayed in the lower bar toward the right in green text on a black background; there is a leading '~' to indicate that this is an estimation, and the mone‐ tary units are US Dollars '$' fan_speed - cpu or system fan speed as reported by lm-sensors; dis‐ played in the lower bar toward the right in black text on a grey back‐ ground; there is a trailing 'rpm' for units; you may override the detected fan by setting FAN=/sys/path/to/your/fan1_input in $BYOBU_CON‐ FIG_DIR/statusrc hostname - the hostname of the system; displayed in the upper bar on the far right in bold black text on a grey background; there is a lead‐ ing '@' symbol if the username status is also enabled ip_address - the IPv4 address of the system in dotted decimal form; displayed in the upper bar on the far right in bold black text on a grey background; you can override and display your IPv6 address by setting 'IPV6=1', and you can show your external ip address by setting 'IP_EXTERNAL=1' in $BYOBU_CONFIG_DIR/statusrc ip_address4 - the IPv4 address of the system in dotted decimal form; displayed in the upper bar on the far right in bold black text on a grey background; you can show your external ip address by setting 'IP_EXTERNAL=1' in $BYOBU_CONFIG_DIR/statusrc ip_address6 - the IPv6 address of the system; displayed in the upper bar on the far right in bold black text on a grey background; you can show your external ip address by setting 'IP_EXTERNAL=1' in $BYOBU_CON‐ FIG_DIR/statusrc load_average - the system load average over the last 1 minute; dis‐ played in the lower bar toward the right in black text on a yellow background logo - an approximation of the current operating system's logo; dis‐ played in the lower bar on the far left; you may customize this logo by setting a chosen logo in $BYOBU_CONFIG_DIR/logo, or you may override this with LOGO=:-D in $BYOBU_CONFIG_DIR/statusrc mail - system mail for the current user; the letter '[M]' is displayed in the lower bar toward the left in black text on a grey background memory - total memory available and used percentage in the system; dis‐ played in the lower bar toward the right in white text on a green back‐ ground menu - a simple indicator directing new users to use the F9 keybinding to access the byobu menu network - instantaneous upload/download bandwidth in [GMk]bps over the last 3 seconds; nothing is displayed if traffic is 0; displayed in the lower bar toward the left in white text on a purple background with a leading '^' sign indicating 'up' and 'v' sign indicating 'down'; over‐ ride the default interface by specifying an alternate interface with MONITORED_NETWORK=eth1, and override the default units (bits) with NET‐ WORK_UNITS=bytes, and override the default NETWORK_THRESHOLD=20 (kbps) in $BYOBU_CONFIG_DIR/statusrc notify_osd - Send on-screen notification messages to screen's notifica‐ tion buffer processes - total number of processes running on the system; displayed in the lower bar in white text on a dark yellow background with a trailing '&' indicating 'background processes' reboot_required - symbol present if a reboot is required following a system update; displayed in the lower bar white text on a blue back‐ ground by the symbol '(R)'; additionally, reboot_required will print '<F5>' in white text on a blue background, if Byobu requires you to reload your profile to affect some changes; it will also detect if your system is currently in powernap(8) state and if so print '.zZ'; if your system is currently performing an unattended-upgrade(1) you will see a white warning sign on a red background. release - OS/distribution name of the release running on the current system as reported by lsb_release(1) or /etc/issue; displayed in the lower bar in bold black text toward the left on a grey background; you may override the detected release with RELEASE=Whatever in $BYOBU_CON‐ FIG_DIR/statusrc; you may also abbreviate the release string to N char‐ acters by setting RELEASE_ABBREVIATED=N in $BYOBU_CONFIG_DIR/statusrc services - users can configure a list of services to monitor, define the SERVICES variable in $BYOBU_CONFIG_DIR/statusrc, a whitespace sepa‐ rated of services, each service should include the init name of the service, then a pipe, and then an abbreviated name or symbol to display when running (e.g. SERVICES="ssh|ssh apache2|http"); displayed in the lower bar toward the center in cyan on a white background session - byobu session name (only supported in byobu-tmux(1)); dis‐ played in the lower bar on the left in underlined black text on a white background swap - total swap space and total used as a percentage of the total available; displayed in the lower bar toward the right in black text on a light green background with a trailing '%' sign time - the system time in HH:MM:SS format (by default), or you can set this to any valid strftime(3) you like in $BYOBU_CONFIG_DIR/datetime; displayed in the lower bar on the far right in the default text and default background colors time_binary - only for the hard core geek, the local system time in binary; requires UTF-8 support in a VERY recent version of GNU Screen; displayed in the lower bar on the far right in the default text and background colors time_utc - the UTC system time in HH:MM format; displayed in the lower bar on the far right in dark text on a light background updates_available - the number of updates available on the system; dis‐ played in the lower bar toward the right in white text on a red back‐ ground with a trailing '!' sign; if any updates are marked 'security updates', then there will be a total of two trailing exclamation points, '!!' uptime - the total system uptime since last boot; displayed in the lower bar toward the right in blue text on a grey background users - the number of remote users logged into the system via sshd, empty if 0 users; displayed in the lower bar toward the right in red text on a grey background with a trailing '#' sign; set USERS_DIS‐ TINCT=1 to instead count the number of distinct users logged into the system (rather than open ssh sessions) whoami - the name of the user who owns the screen session; displayed in the upper bar toward the far right in bold black text on a grey back‐ ground wifi_quality - the connection rate and signal quality of the wifi con‐ nection; displayed in the lower bar toward the right in black text on a cyan background; the connection rate is in 'Mb/s' and the signal qual‐ ity is as a percentage with a trailing '%'; override the default inter‐ face by specifying an alternate interface with MONITORED_NETWORK=wlan0 in $BYOBU_CONFIG_DIR/statusrc SESSIONS Byobu name screen sessions "byobu", if unspecified. To hide sessions from byobu-select-session(1), prepend a "." to the beginning of the session name, like: byobu -S .hidden WINDOWS Each open window in the screen session is displayed in the upper bar toward the far left. These are numbered, and include indicators as to activity in the window (see "activity" in screen(1) and tmux(1) for symbol definitions). The current active window is highlighted by inverting the background/text from the rest of the window bar. Users can create a list of windows to launch at startup in $BYOBU_CON‐ FIG_DIR/windows and $BYOBU_CONFIG_DIR/windows.tmux. This file is the same syntax as ~/.screenrc and ~/.tmuxrc, each line specifying a win‐ dow, as described in screen(1) or tmux(1). User can also launch Byobu with unique window sets. Users can store these as $BYOBU_CONFIG_DIR/windows.[NAME] and $BYOBU_CONFIG_DIR/win‐ dows.tmux.[NAME], and launch Byobu with the environment variable BYOBU_WINDOWS=NAME. For example: $ cat $BYOBU_CONFIG_DIR/windows.ssh_sessions screen -t localhost bash screen -t aussie ssh root@aussie screen -t beagle ssh root@beagle screen -t collie ssh root@collie $ BYOBU_WINDOWS=ssh_sessions byobu For example: $ cat $BYOBU_CONFIG_DIR/windows.tmux.split4 new-session 'bash' ; new-window -n term1 ; new-window -n term2 ; new-window -n ssh ssh 10.9.8.7 ; split-window ; split-window ; split-window ; select-layout tiled ; select-pane -t 0 $ BYOBU_WINDOWS=split4 byobu UNITS OF MEASURE byobu uses binary for capacity measurements of KB, MB, GB, and TB. This means multiples of 1024 rather than multiples of 1000, in accor‐ dance with JEDEC Standard 100B.01 for disk and memory capacity measure‐ ments. See: * http://en.wikipedia.org/wiki/JEDEC_memory_standards byobu uses decimal for measurements of network data transfer, meaning multiple of 1000, rather than 1024. See: * http://en.wikipedia.org/wiki/Data_rate_units KEYBINDINGS byobu keybindings can be user defined in /usr/share/byobu/keybindings/ (or within .screenrc if byobu-export was used). The common key bindings are: F2 - Create a new window F3 - Move to previous window F4 - Move to next window F5 - Reload profile F6 - Detach from this session F7 - Enter copy/scrollback mode F8 - Re-title a window F9 - Configuration Menu F12 - Lock this terminal shift-F2 - Split the screen horizontally ctrl-F2 - Split the screen vertically shift-F3 - Shift the focus to the previous split region shift-F4 - Shift the focus to the next split region shift-F5 - Join all splits ctrl-F6 - Remove this split ctrl-F5 - Reconnect GPG and SSH sockets shift-F6 - Detach, but do not logout alt-pgup - Enter scrollback mode alt-pgdn - Enter scrollback mode Ctrl-a $ - show detailed status Ctrl-a R - Reload profile Ctrl-a ! - Toggle key bindings on and off Ctrl-a k - Kill the current window Ctrl-a ~ - Save the current window's scrollback buffer SCROLLBACK, COPY, PASTE MODES Each window in Byobu has up to 10,000 lines of scrollback history, which you can enter and navigate using the alt-pgup and alt-pgdn keys. Exit this scrollback mode by hitting enter. You can also easily copy and paste text from scrollback mode. To do so, enter scrollback using alt-pgup or alt-pgdn, press the spacebar to start highlighting text, use up/down/left/right/pgup/pgdn to select the text, and press enter to copy the text. You can then paste the text using alt-insert or ctrl- a-]. BUGS For Byobu colors to work properly, older versions of GNU Screen require a 1-line patch to adjust MAX_WINMSG_REND in screen.c. The change is in GNU Screen's upstream source control system as of 2010-01-26, but GNU Screen has not released a new upstream version in several years. You can disable colors entirely by setting MONOCHROME=1 in $BYOBU_CON‐ FIG_DIR/statusrc. For more information, see: * http://savannah.gnu.org/bugs/?22146 PuTTY users have reported that the F2, F3, and F4 shortcut keys are not working properly. PuTTY sends the same escape sequences as the linux console for F1-F4 by default. You can fix this problem in the PuTTY config, Terminal -> Keyboard -> Function keys: Xterm R6. See: http://www.mail-archive.com/screen-users@gnu.org/msg01525.html PuTTY users should configure enable UTF-8 characters in order to fix status refresh issues. You can fix this problem in the PuTTY configu‐ ration, Window -> Translation: select UTF-8. PuTTY users should avoid resizing their window to one character tall, as this can sometimes crash byobu-screen. Apple Mac OSX terminal users have reported 'flashing text'. You can fix this in the advanced settings of the terminal application, with 'Declare Terminal As: xterm-color'. Apple Mac keyboard users may need to specify a vt100 terminal by adding this to your OSX profile, in order to get Byobu's function keys and colors to work: alias ssh='TERM=vt100 ssh' Users of a non-UTF-8 locale (such as cs_CZ charset ISO-8859-2), may need to add "defutf8 off" to ~/.screenrc, if some characters are ren‐ dering as "?". Users who customize their PS1 prompt need to put this setting in ~/.bashrc, rather than ~/.profile, in order for it to work correctly with Byobu. If you run byobu(1) under sudo(8), you must use the -H option, such that the user's $HOME directory environment variable is set properly. Otherwise, byobu(1) will create a bunch of directories in the $SUDO_USER's $HOME, but will be owned by root. To prevent this from happening, byobu(1) will simply refuse to run if $USER does not own $HOME. Byobu requires a suitable ulimit(3) values to run. If you get an error at startup saying, 'pipe: too many open files', then check your ulimit -a values, as your "open files" or "max user processes" are too low. In this case, you will probably need to run simple screen(1) SEE ALSO screen(1), byobu-config(1), byobu-export(1), byobu-status(1), byobu- status-detail(1), byobu-enable(1), byobu-launch(1), byobu-select-back‐ end(1), tmux(1) http://byobu.org AUTHOR This manpage and the utility were written by Dustin Kirkland <kirk‐ land@byobu.org> for Ubuntu systems (but may be used by others). Per‐ mission is granted to copy, distribute and/or modify this document and the utility under the terms of the GNU General Public License, Version 3 published by the Free Software Foundation. The complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL on Debian/Ubuntu systems, or in /usr/share/doc/fedora-release-*/GPL on Fedora systems, or on the web at http://www.gnu.org/licenses/gpl.txt. byobu 19 June 2009 byobu(1)