Rotate logs manually linux

List cron jobs system-wide for u in $(cut -f1 -d: /etc/passwd); do crontab -l -u $u 2>/dev/null | grep -v '^#' | sed "s|^|$u: |"; done Cron expression tester systemd-analyze calendar '*/5 * * * *' Redirect stderr to file command > /tmp/out.log 2> /tmp/err.log Capture both streams command 2>&1 | tee /tmp/all.log Replace string in files recursively grep -rl 'old_string' /etc/ | xargs sed -i 's/old_string/new_string/g'