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It gives a 'xcd' command for changing directory to one of CWDs of other ZSH processes (typically running in a terminal emulator). Useful for single-windowed terminal emulators like XTerm or Rxvt which don't have ability to pass CWD of one shell to another.
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If you can do better, submit your command here.
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you could also use:
for pid ($(pgrep -x zsh)) reply+=$(readlink /proc/$pid/cwd)