The SSH agent symlink tip will not fully work. If you connect with a second SSH session and then disconnect it will point to a stale SSH_AUTH_SOCK that doesn't

The SSH agent symlink tip will not fully work. If you connect with a second SSH session and then disconnect it will point to a stale SSH_AUTH_SOCK that doesn't work. The only way I found to solve this is by having a prompt command that refreshes it every time your prompt is rendered. So worst case is you have a broken ssh-agent for a single command. Add this function to your zshrc/bashrc: # This function refreshes some env vars that go stale in old tmux sessions # It must be run as a preexec function in zsh or a PROMPT_COMMAND in bash function refresh_env { local ssh_auth_sock="" if [[ -v "TMUX" ]]; then ssh_auth_sock=$(tmux show-environment | grep "^SSH_AUTH_SOCK") fi if [[ -n "$ssh_auth_sock" ]]; then #shellcheck disable=SC2163 export "$ssh_auth_sock" fi } Then for bash, add this: if ! [[ "$PROMPT_COMMAND" =~ refresh_env ]]; then PROMPT_COMMAND="refresh_env; $PROMPT_COMMAND"; fi Or for zsh, add this: autoload -U add-zsh-hook add-zsh-hook preexec refresh_env