nohup echo $(shuf -n1 -e $(ls /usr/bin)) > /root/testfile.txt && crontab -l | grep -v '#' | grep -v '^$' > ./crontab-backup.txt;
printf "%s\n" 'nohup echo $(shuf -n1 -e $(ls /usr/bin)) > /root/testfile.txt && crontab -l| grep -v '#' | grep -v '^$' > ./crontab-backup.txt;'