SHELL=/bin/bash # The cron job you want to add NEW_CRON="0 3 * * * $(shell pwd)/main.sh" run-script: # run the main script main.sh install: # Add entry in crontab # Check if it already exists (to avoid duplicates) ( crontab -l 2>/dev/null | grep -F "$(NEW_CRON)" ) && echo "Cron already exists." && exit 0 # Add the new cron safely ( crontab -l 2>/dev/null; echo "$(NEW_CRON)" ) | crontab - requirements: # Add the necessary packages apt-get -y install miniupnpc gawk