Preserve selected environment variables

tmux

set -g update-environment "DISPLAY SSH_AUTH_SOCK SSH_AGENT_PID WINDOWID XAUTHORITY"

Explanation

Useful when SSH agent forwarding or GUI-related variables disappear after attaching.

Learn the surrounding workflow

Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Same sheet · prioritizing Common problems and fixes

Use a terminal definition with 256-color/feature support.

Open In sheettmuxsame section

Terminate the tmux server entirely.

Open In sheetbashsame section

Verify config sourcing from a shell wrapper.

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Inspect environment variables known to tmux.

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Inspect current global configuration.

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Inspect per-window settings.

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