add line to crontab via command line

[NickTheGreek 160]

Hi,
I wrote this script in order to add a line to root crontab if it does not already contain such line. The script also checks if the crontab is empty. Is there a better way to achieve this?

Code:

cronList=$(sudo crontab -u root -l)
if [ $(echo $cronList | grep -c "@weekly /home/user/command") -eq 0 ]; then
    if [ -z "$cronList" ]; then
        echo "@weekly /home/user/command" | sudo crontab -u root -
    else
        (sudo crontab -u root -l; echo "@weekly /home/user/command" ) | sudo crontab -u root -
    fi
fi

Thank you

 

https://ubuntuforums.org/showthread.php?t=2315654