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Bash script to retry a failed command
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#!/bin/bash | |
# Retries a command on failure. | |
HELP=\ | |
"$0: $0 [flags] [options] [--] COMMAND | |
Runs a command, retrying if the command fails | |
Arguments: | |
COMMAND The command to run | |
Flags: | |
-h, --help Display this message and exit | |
--forever Retry until the command succeeds | |
Options: | |
-n, --num-attempts number The maximum number of times to retry the command (default: 10) | |
-d, --delay number The number of seconds to wait between attempts (default: 3)" | |
sleep_duration=3 | |
num_attempts=10 | |
params="" | |
forever="" | |
while (( "$#" )); | |
do | |
case "$1" in | |
-h|--help) | |
echo "$HELP" | |
exit 0 | |
;; | |
--forever) | |
forever=true | |
shift | |
;; | |
-d|--delay) | |
sleep_duration="$2" | |
shift 2 | |
;; | |
-n|--num-attempts) | |
num_attempts="$2" | |
shift 2 | |
;; | |
--) | |
shift 1 | |
params="$params $@" | |
break | |
;; | |
*) | |
params="$params $1" | |
shift | |
;; | |
esac | |
done | |
eval set -- "$params" | |
retry () { | |
local -r -i max_attempts="$1"; shift | |
local -r cmd="$@" | |
local -i attempt_num=1 | |
until $cmd | |
do | |
attempt_str="$attempt_num/$max_attempts" | |
if [ "$forever" = true ]; | |
then | |
attempt_str="$attempt_num" | |
fi | |
if (( attempt_num == max_attempts )) && [ "$forever" != true ]; | |
then | |
echo "Attempt $attempt_str failed. Giving up." | |
return 1 | |
else | |
echo "Attempt $attempt_str failed. Retrying in $sleep_duration seconds..." | |
((attempt_num++)) | |
sleep "$sleep_duration" | |
fi | |
done | |
} | |
retry "$num_attempts" "$@" |
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