51

There's some lines of my tmux.conf which I'd like executed only if my OS is Mac. However, I'd like to use my tmux.conf on multiple different operating systems. How can I make a command conditional to the OS on which tmux is currently running?

Mokubai
  • 92,720
muckabout
  • 611

3 Answers3

65

Use the if-shell command:

if-shell "uname | grep -q Darwin" "tmux-cmd1; tmux-cmd2;" "tmux-cmd3; tmux-cmd4"

You may want to put OS-specific commands in separate files, and execute them via the "source-file" command.

if-shell "uname | grep -q Darwin" "source-file .tmux-macosx" "source-file .tmux-linux"
chepner
  • 6,851
  • 9
    The if-shell and run-shell tmux commands are currently asynchronous (as of tmux 1.7); they effectively run their shell command in the background, and any tmux commands that they run will only be executed after any commands that come after the if-shell or run-shell command itself (tmux is single-threaded). Effectively, if you use if-shell or run-shell in ~/.tmux.conf, the initial session (and any sessions, windows, or panes created explicitly created through ~/tmux.conf) will lack any tmux configuration arranged through if-shell or run-shell commands. – Chris Johnsen Jan 22 '13 at 03:01
  • 1
    @ChrisJohnsen if-shell works as expected for me with tmux 1.8. I am using it to set set-titles-string only for SSH: https://github.com/blueyed/dotfiles/commit/cd9e2b0115f579af0954ea89d9b542d4230df2e3 – blueyed Feb 19 '14 at 13:59
  • 3
    This should be accepted; it's the proper way to do it. – CatDadCode Nov 14 '14 at 18:06
13

Jimeh https://github.com/jimeh/dotfiles/commit/3838db8 has the answer. Also Chris Johnsen deserves a lot of credit for helping people on the GitHub issue here: https://Github.com/ChrisJohnsen/tmux-MacOSX-pasteboard/issues/8#issuecomment-4134987

Basically, you set up a shell script called safe-reattach-to-user-namespace that checks for the existence of the real reattach... command.

#! /usr/bin/env bash

If reattach-to-user-namespace is not available, just run the command.


if [ -n "$(command -v reattach-to-user-namespace)" ]; then
  reattach-to-user-namespace $@
else
  exec "$@"
fi
phuclv
  • 27,773
Ivan -Oats- Storck
  • 453
0

The if-shell check must be in a string and the command to run must be enclosed in {}. Here is an example of how to bind the ] key to paste the system clipboard, with a command that varies depending on the operating system.

if-shell 'uname | grep -q Linux' { bind-key ] run "tmux set-buffer \"$(xclip -o -sel clipboard)\"; tmux paste-buffer" } 
if-shell 'uname | grep -q Darwin' { bind ] run "reattach-to-user-namespace pbpaste | tmux load-buffer - && tmux paste-buffer" }
bigzhu
  • 1
  • 1
    Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center. – Community Mar 13 '23 at 06:05