snippetbashTip

until — Simple shell loop that repeats until it receives zero as return value. More information: <https://ww

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the until command: 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>.

Solution

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

Wait for a systemd service to be active:

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

Code Snippets

Execute a command until it succeeds

until {{command}}; do :; done

Wait for a systemd service to be active

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

Context

tldr-pages: common/until

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