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...to tell > upstart not to wait for the process (you couldn't use respawn > with that because then the process is not managed by upstart > anymore). The problem in my script appears to be this: # SSH switches used: env SSH_SWITCHES="" env SSH_SWITCHES=${SSH_SWITCHES}" -nNqT -vvv " Upon further investigation I discovered that the env stanza does not expand previously defined variables. My attempt at concatenating values results in the key name being used instead of its value. In other words: '${SSH_SWITCHES} -nNqT -vvv' is what results and not simply '...