List all cronjobs on system.

lscron

#!/bin/bash

for user in $(cut -f1 -d: /etc/passwd); do
	CRONTAB="$(sudo crontab -u "$user" -l 2> /dev/null | sed '/^[[:space:]]*#/d; /^[[:space:]]*$/d')"

	if (( $? )) || [ -z "$CRONTAB" ]; then
		continue
	fi

	echo "# CRONTAB FOR: $user"
	echo "$CRONTAB"
	echo "# END CRONTAB FOR: $user"
	echo
done

wget https://gist.github.com/Zenexer/6047598/raw/lscron && chmod +x lscron
# OR
curl -o lscron https://gist.github.com/Zenexer/6047598/raw/lscron && chmod +x lscron