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93 lines
2.1 KiB
Bash
Executable File
93 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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#
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# x-until-error: Repeatedly execute a command until it fails (non-zero exit status)
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#
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# Description:
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# This script executes the given command repeatedly until it returns a non-zero
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# exit status. It always runs the command at least once.
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#
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# This script is based on the original work by Steve Kemp.
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# Original work Copyright (c) 2013 by Steve Kemp.
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#
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# The code in the original repository may be modified and distributed under your choice of:
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# * The Perl Artistic License (http://dev.perl.org/licenses/artistic.html) or
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# * The GNU General Public License, version 2 or later (http://www.gnu.org/licenses/gpl2.txt).
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#
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# Modifications and enhancements by Ismo Vuorinen on 2025.
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#
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# Usage:
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# x-until-error [--sleep SECONDS] command [arguments...]
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#
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# Options:
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# --sleep SECONDS Wait SECONDS (default: 1) between command executions.
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# -h, --help Display this help message.
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#
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# Example:
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# x-until-error --sleep 2 ls -l
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# Default sleep interval between executions.
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SLEEP_INTERVAL=1
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# Function to display usage information.
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usage()
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{
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cat << EOF
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Usage: $0 [--sleep SECONDS] command [arguments...]
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Repeats the given command until it fails (returns a non-zero exit status).
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Options:
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--sleep SECONDS Wait SECONDS (default: 1) between command executions.
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-h, --help Display this help message.
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Example:
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$0 --sleep 2 ls -l
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EOF
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exit 1
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}
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# Parse command-line options.
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while [ $# -gt 0 ]; do
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case "$1" in
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--sleep)
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shift
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if [ $# -eq 0 ]; then
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echo "Error: --sleep requires a numeric argument." >&2
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exit 1
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fi
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SLEEP_INTERVAL="$1"
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shift
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;;
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-h | --help)
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usage
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;;
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--) # End of options marker.
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shift
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break
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;;
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-*)
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echo "Error: Unknown option: $1" >&2
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usage
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;;
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*)
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break
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;;
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esac
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done
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# Ensure a command is provided.
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if [ $# -eq 0 ]; then
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echo "Error: No command specified." >&2
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usage
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fi
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# Execute the command repeatedly until it fails.
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while true; do
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"$@"
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status=$?
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if [ $status -ne 0 ]; then
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exit $status
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fi
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sleep "$SLEEP_INTERVAL"
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done
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