Comet is a zero dependency Cron management app. Schedule and execute shell commands using Cron syntax.

note: there are a few dev dependencies (typescript, nodemon, pkg) but no compiled ones.

Method 1 - compile from source

git clone https://github.com/lostVkng/comet
cd comet
npm install
npm run build

Clone this directory

Note: requires node.js installed.

npm run package

Build the binary

Method 2 - Download binary from this repo

Download from releases, the binaries are named for OS, just remove the -ubuntu/-macos/-win from the name.

/usr/local/bin is popular place for CLI apps, but nothing preventing you from a different directory and adding it to your path.

Sample Daemon examples are in daemons directory. A daemon will allow comet server to run in the background.

comet list

Lists all cron jobs

comet status

Lists all actively running Cron jobs

comet add -name="xdatafetch.py" "* * * * *" python3 ~/xdatafetch.py

Creates a new cron job with name xdatafextch.py. Add jobs require a name to distinguish them. Newly added jobs are automatically set to active.

comet del xdatafetch.py

Kills and deletes job with name xdatafetch.py

comet start xdatafetch.py

Re-activates inactive job named xdatafetch.py. This job will be ran on the next cron interval.

comet stop xdatafetch.py

De-activates active job named xdatafetch.py. This job will not be ran until activated.

comet kill xdatafetch.py

Kills any actively running process for xdatafetch.py job.

comet server

Starts Comet server, this is needed by any daemon manager to run in the background.

Cron syntax allows us to specify when to launch a task with only a space seperated string.

The syntax is seperated as so:

minute hour day(month) month day(week)

* any value
, value list seperator
- range of values
/ step values

'* * * * *'

Run every minute/hour/day/month/day of week

'5 4 * * *'

Run every 4th hour and 5th minute for every day/month/day of week

'0 22 * * 1-5'

Run at 22h00 every weekday