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I've just tried installing tmux from source (via installing libevent first). The installation seemed fine, without throwing any obvious error. But when I typed tmux in iTerm2, it returned "command not found". However, there is clearly an executable named tmux in /opt/bin/.

So I am a bit puzzled that whether I have successfully installed tmux on my mac. How do I get it work with iTerm2?

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When you type tmux in a shell, the shell looks for an executable called tmux in one of the directories enumerated in the PATH variable (it's a colon-separated list of directories). Check if /opt/bin is in your path:

echo $PATH

If /opt/bin is not in your path, then either install tmux in a different directory that is in your path, or add /opt/bin to your path. The usual place to set the PATH variable is in ~/.profile, or in ~/.bash_profile if you have that but no ~/.profile, or in ~/.zprofile if your shell is zsh.

If /opt/bin is in your path, what's happening is that your shell is keeping the path contents in a cache in memory and not noticing the new addition. Run hash -r to rebuild the cache in this shell. Each shell instance builds its own cache, so you won't have this problem in shells that you start after the installation of tmux.

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when you say install tmux in a different directory, do you mean simply moving the executable from /opt/bin to one of the directories that is on my path? Thanks. –  Simon Jan 8 '12 at 17:07
    
@Simon Yes, or pass a different path for make install (setting whatever variable the makefile uses). Or you can make a symbolic link from /opt/bin/tmux to a directory in your path, but I recommend picking a method that won't require extra work for other software that you'll install manually in the future. –  Gilles Jan 8 '12 at 18:10
    
I'd suggest using Homebrew mxcl.github.com/homebrew for managing command line tools like tmux and others. It handlers installation, updates, removal, etc, and tools are available immediately in the current PATH after installation. –  akosma Mar 19 '12 at 7:45
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