retry - The command line retry tool
Retry any shell command with exponential backoff or constant delay.
Instructions
Install:
retry is a shell script, so drop it somewhere and make sure it's added to your $PATH. Or you can use the following one-liner:
sudo sh -c "curl https://raw.githubusercontent.com/kadwanev/retry/master/retry -o /usr/local/bin/retry && chmod +x /usr/local/bin/retry"If you're on OS X, retry is also on Homebrew:
brew install kadwanev/brew/retry
Not popular enough for homebrew-core. Please star this project to help.
Usage
Help:
retry -?
Usage: retry [options] -- execute command
-h, -?, --help
-v, --verbose Verbose output
-t, --tries=# Set max retries: Default 10
-s, --sleep=secs Constant sleep amount (seconds)
-m, --min=secs Exponential Backoff: minimum sleep amount (seconds): Default 0.3
-x, --max=secs Exponential Backoff: maximum sleep amount (seconds): Default 60
-f, --fail="script +cmds" Fail Script: run in case of final failure
State
Environment variable RETRY_ATTEMPT is set with the current attempt number.
Examples
No problem:
retry echo u work good
u work good
Test functionality:
retry 'echo "y u no work"; false'
y u no work
Before retry #1: sleeping 0.3 seconds
y u no work
Before retry #2: sleeping 0.6 seconds
y u no work
Before retry #3: sleeping 1.2 seconds
y u no work
Before retry #4: sleeping 2.4 seconds
y u no work
Before retry #5: sleeping 4.8 seconds
y u no work
Before retry #6: sleeping 9.6 seconds
y u no work
Before retry #7: sleeping 19.2 seconds
y u no work
Before retry #8: sleeping 38.4 seconds
y u no work
Before retry #9: sleeping 60.0 seconds
y u no work
Before retry #10: sleeping 60.0 seconds
y u no work
etc..
Limit retries:
retry -t 4 'echo "y u no work"; false'
y u no work
Before retry #1: sleeping 0.3 seconds
y u no work
Before retry #2: sleeping 0.6 seconds
y u no work
Before retry #3: sleeping 1.2 seconds
y u no work
Before retry #4: sleeping 2.4 seconds
y u no work
Retries exhausted
Bad command:
retry poop
bash: poop: command not found
Fail command:
retry -t 3 -f 'echo "oh poopsicles"' 'echo "y u no work"; false'
y u no work
Before retry #1: sleeping 0.3 seconds
y u no work
Before retry #2: sleeping 0.6 seconds
y u no work
Before retry #3: sleeping 1.2 seconds
y u no work
Retries exhausted, running fail script
oh poopsicles
Last attempt passed:
retry -t 3 -- 'if [ $RETRY_ATTEMPT -eq 3 ]; then echo Passed at attempt $RETRY_ATTEMPT; true; else echo Failed at attempt $RETRY_ATTEMPT; false; fi;'
Failed at attempt 0
Before retry #1: sleeping 0.3 seconds
Failed at attempt 1
Before retry #2: sleeping 0.6 seconds
Failed at attempt 2
Before retry #3: sleeping 1.2 seconds
Passed at attempt 3
License
Apache 2.0 - go nuts