Scheduler for laptops which aren't on 24/7.
brew install hughbien/tap/scron
This will install Crystal as a dependency. If you already have a non-homebrew Crystal installed, you
can use the
--ignore-dependencies crystal option.
Download the latest binary and place it in your
wget -O /usr/local/bin/scron https://github.com/hughbien/scron/releases/download/v0.1.2/scron-linux-amd64 chmod +x /usr/local/bin/scron
MD5 checksum is:
Checkout this repo, run
make install (requires Crystal):
git clone https://github.com/hughbien/scron.git cd scron make make install
Configure scron to run every two hours:
$ crontab -e 0 */2 * * * scron
Configure jobs in
$HOME/.scron. This example runs
cmd arg1 arg2 at least once every 30 days.
30d cmd arg1 arg2
You can also specify lower bounds like day of week (Su, Mo, Tu, We, Th, Fr, Sa), day of month (23rd), or day of year (4/15):
Mo,Fr cmd1 1st,23rd cmd2 4/15 cmd3
cmd1 will attempt to run on Monday and Friday. If your machine is off the entire day, it will run
as soon as possible. Here's an example timeline:
- Mo: machine is off, nothing happens
- Tu: machine is on, cmd1 runs to make up for Monday
- We: already ran, nothing happens
- Th: already ran, nothing happens
- Fr: machine is on, cmd1 runs
An exit status of 0 is considered a success. Anything else is considered a failure and scron will attempt to re-run it again in 2 hours.
$HOME/.scrondb keeps the timestamps of the last run commands.
$HOME/.scronlog has the stdout, timestamps, and exit status of last scheduled commands.
make for common tasks:
make build # to create a release binary in the bin directory make build-static # to build static binary for Linux make install # to copy release binary into system bin (uses $INSTALL_BIN) make spec # to run all tests make spec ARGS=path/to/spec # to run a single test make clean # to remove build artifacts and bin directory make run # to run locally make run ARGS=-h # to run with local arguments
Copyright 2021 Hugh Bien.
Released under BSD License, see LICENSE for details.