tldr/pages/common/until.md

until

Simple shell loop that repeats until it receives zero as return value. More information: https://www.gnu.org/software/bash/manual/bash.html#index-until.

• Execute a command until it succeeds:

until {{command}}; do :; done

• Try to connect to an SSH host until gracefully disconnected:

until ssh {{username}}@{{host}}; do sleep {{2}}; done

• Wait for a systemd service to be active:

until systemctl is-active {{[-q|--quiet]}} {{nginx}}; do {{echo "Waiting..."}}; sleep 1; done; {{echo "Launched!"}}