delayexec

Delay command execution depends on crontab.

For oneshot command, automatically calculate due time and add command to crontab, remove from crontab after the command was executed. For repeat command, just add to crontab.

Note: Make sure crond service is running.

Install

Download pre-built binary from Releases page.

wget -c https://github.com/WqyJh/delayexec/releases/latest/download/delayexec-linux-amd64.tar.gz -O - | tar -xz delayexec
chmod +x delayexec
sudo mv delayexec /usr/local/bin

Or if you have golang environment, just install with go.

go install github.com/WqyJh/delayexec@latest

Usage

Execute ls -al after 10 minute. Duration must match golang's time.ParseDuration format.

delayexec -d 10m -- ls -al

Execute ls at 2022-04-05 12:00:00 in default time zone. Time format is 2006-01-02 15:04:05.

delayexec -t '2022-04-05 12:00:00' -- ls

The command would be executed in current working directory, and an delayexec.log would be generated in it.

Use -w to change working directory, -l to change log file.

delayexec -w /tmp -l ls.log -t '2022-04-05 12:00:00' -- ls

Cancel execution

If you decide to cancel the command to be executed

• with -t option: just add --cancel option such as

  delayexec --cancel -t '2022-04-05 12:00:00' -- ls

• with -d option: cannot be directly canceled.

  1. Use crontab -l to see the generated script.

     $ crontab -l
     0 2 10 4 * /home/ubuntu/.delayexec/git/1649556000.sh

  2. Use cat find the line with --cancel option.

     $ cat /home/ubuntu/.delayexec/git/1649556000.sh
     #!/bin/sh
     cd /home/ubuntu/docker-ssh
     git push origin master >>delayexec.log 2>&1
     /home/ubuntu/docker-ssh/delayexec --cancel -t "2022-04-10 2:00:00" -- ls -al >>delayexec.log 2>&1

  3. Execute the command with --cancel option.

     /home/ubuntu/docker-ssh/delayexec --cancel -t "2022-04-10 2:00:00" -- ls -al