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dot_tmux/plugins/tmux-resurrect/docs/save_dir.md

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+# Resurrect save dir
+
+By default Tmux environment is saved to a file in `~/.tmux/resurrect` dir.
+Change this with:
+
+    set -g @resurrect-dir '/some/path'
+
+Using environment variables or shell interpolation in this option is not
+allowed as the string is used literally. So the following won't do what is
+expected:
+
+    set -g @resurrect-dir '/path/$MY_VAR/$(some_executable)'
+
+Only the following variables and special chars are allowed:
+`$HOME`, `$HOSTNAME`, and `~`.