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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 OS's. How can I make a command conditional to the OS on which tmux is currently running?

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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"
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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 at 3:01

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