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rainbarf - CPU/RAM/battery stats chart bar for tmux (and GNU screen)
version 1.4
rainbarf --tmux --width 40 --no-battery
Fancy resource usage charts to put into the tmux
<> status line. The CPU utilization history
chart is tinted with the following colors to reflect the system memory
* green: free memory;
* yellow: active memory;
* blue: inactive memory;
* red: wired memory on Mac OS X / FreeBSD; "unaccounted" memory on
* cyan: cached memory on Linux, buf on FreeBSD.
* magenta: used swap memory.
If available, battery charge is displayed on the right.
Just go to to see some
* Traditional way:
perl Build.PL
./Build test
./Build install
* Homebrew <> way:
brew install rainbarf
* MacPorts <> way:
port install rainbarf
* CPAN way:
cpan -i App::rainbarf
* Modern Perl way:
cpanm git://
Add the following line to your ~/.tmux.conf file:
set-option -g status-utf8 on
set -g status-right '#(rainbarf)'
Or, under GNOME Terminal:
set-option -g status-utf8 on
set -g status-right '#(rainbarf --rgb)'
Reload the tmux config by running tmux source-file ~/.tmux.conf.
~/.rainbarf.conf can be used to persistently store "OPTIONS":
# example configuration file
width=20 # widget width
bolt # fancy charging character
remaining # display remaining battery
rgb # 256-colored palette
"OPTIONS" specified via command line override that values.
Configuration file can be specified via RAINBARF environment variable:
RAINBARF=~/.rainbarf.conf rainbarf
Display the battery charge indicator. Enabled by default.
Display the time remaining until the battery is fully charged/empty.
See "CAVEAT". Disabled by default.
Display even fancier battery indicator. Disabled by default.
Tricky one. Disabled by default. See "CAVEAT".
Use the RGB palette instead of the system colors. Also disabled by
default, for the same reasons as above.
Force chart foreground color.
Force chart background color.
Use load average <>
metric instead of CPU utilization. You might want to set the --max
threshold since this is an absolute value and has varying ranges on
different systems. Disabled by default.
Display the swap usage. Used swap amount is added to the total
amount, but the free swap amount is not! Disabled by default.
--max NUMBER
Maximum loadavg you expect before rescaling the chart. Default is 1.
--order INDEXES
Specify the memory usage bar order. The default is fwaic ( free,
wired, active, inactive & cached ).
Force tmux colors mode. By default, rainbarf detects automatically if
it is being called from tmux or from the interactive shell.
<> colors
mode. Experimental. See "CAVEAT".
--width NUMBER
Chart width. Default is 38, so both the chart and the battery
indicator fit the tmux status line. Higher values may require
disabling the battery indicator or raising the status-right-length
value in ~/.tmux.conf.
--datfile FILENAME
Specify the file to log CPU stats to. Default: $HOME/.rainbarf.dat
--skip NUMBER
Do not write CPU stats if file already exists and is newer than this
many seconds. Useful if you refresh tmux status quite frequently.
Time remaining
If the --remaining option is present but you do not see the time in
your status bar, you may need to increase the value of
status-right-length to 48.
Color scheme
If you only see the memory usage bars but no CPU utilization chart,
that's because your terminal's color scheme need an explicit
distinction between foreground and background colors. For instance,
"red on red background" will be displayed as a red block on such
terminals. Thus, you may need the ANSI bright attribute for greater
contrast, or maybe consider switching to the 256-color palette. There
are some issues with that, though:
1. Other color schemes (notably, solarized
<>) have different meaning for
the ANSI bright attribute. So using it will result in a quite
psychedelic appearance. 256-color pallette, activated by the --rgb
flag, is unaffected by that.
2. The older versions of Term::ANSIColor dependency do not recognize
bright/RGB settings, falling back to the default behavior (plain 16
colors). However, the whole Term::ANSIColor is optional, it is only
required to preview the effects of the "OPTIONS" via command line
before actually editing the ~/.tmux.conf. That is, rainbarf --bright
--tmux is guaranteed to work despite the outdated Term::ANSIColor!
Another option is skipping the system colors altogether and use the RGB
palette (rainbarf --rgb). This fixes the issue 1, but doesn't affect
the issue 2. It still looks better, though.
Persistent storage
CPU utilization stats are persistently stored in the ~/.rainbarf.dat
file. Every rainbarf execution will update and rotate that file. Since
tmux calls rainbarf periodically (every 15 seconds, by default), the
chart will display CPU utilization for the last ~9.5 minutes (15 * 38).
Thus, several tmux instances running simultaneously for the same user
will result in a faster chart scrolling.
Stable screen version unfortunately has a broken UTF-8 handling
specifically for the status bar. Thus, I have only tested the rainbarf
with the variant from git:// My
~/.screenrc contents:
backtick 1 15 15 rainbarf --bright --screen
hardstatus string "%1`"
hardstatus lastline
* top(1)
is used to get the CPU/RAM stats if no /proc filesystem is available.
* ioreg(8)
is used to get the battery status on Mac OS X.
* ACPI <> is used
to get the battery status on Linux.
* Battery <> was a source of
* Spark <> was another source of
Stanislaw Pusep <>
* Chris Knadler <>
* cinaeco <>
* Clemens Hammacher <>
* H.Merijn Brand <>
* Henrik Hodne <>
* Joe Hassick <>
* Josh Matthews <>
* Lars Engels <>
* Sergey Romanov <>
* Tom Cammann <>
* Tuomas Jormola <>
This software is copyright (c) 2016 by Stanislaw Pusep <>.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.