Chronic
A tool to hide
stdoutandstderrwhen a program runs successfully (i.e., returns exit code 0).
About
This is a go based version of the classic cronic or chronic tool. Chuck Houpt wrote the original chronic.
Usage
If you've ever used cron to run jobs, you know that it sends an email for any output generated by the command. This is why you see crontabs that look like this:
[email protected]
PATH=/usr/bin:/bin
0 4 0 0 0 my-noisy-command -vF >/dev/null 2>&1
This is an anti-pattern:
- If you failed to get the command line correct, then you'll end up getting an email.
- If anything goes wrong, you've lost the output.
- If you log to a file, then you have to rotate that log, even if 99% of the contents are useless.
With chronic you don't have to worry about that anymore!
[email protected]
PATH=/usr/bin:/bin
0 4 0 0 0 chronic my-noisy-command -vF
Now, you'll get no emails unless my-noisy-command returns a non-zero exit code. If it does return a non-zero exit code, then you'll get an email that looks like this:
To: [email protected]
Subject: [CRON] chronic my-noisy-command -vF
**** command ****
[`bash` `-c` `echo "boo"; echo "emergency" 1>&2; exit 10`]
**** stdout ****
stdout: Normal output from the noisy command.
stdout: Starting messages
stdout: Normal stuff
**** stderr ****
stderr: Standard error output from the noisy command.
stderr:
stderr: [FATAL] Something went wrong!
Exited with 10Installation
Download binaries
Homebrew
brew install docwhat/tap/chronicGitHub Releases
The latest release is available on github.com/docwhat/chronic/releases. You can download the binary for your architecture and OS there.
Source
go get docwhat.org/chronicCompile it yourself
You'll need to install a recent version of Go and set it up. You can check the .travis.yml file to see what version of go I'm using.
go get -u docwhat.org/chronicDevelopers
I love contributions! Read CONTRIBUTING.md!