Count lines in all logs linux
Find the biggest log files by line count
find /var/log -name '*.log' -exec wc -l {} + | sort -rn | head -20
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Follow multiple log files
tail -f /var/log/syslog /var/log/auth.log
Search compressed logs
zgrep -i 'error' /var/log/syslog.*.gz
Rotate logs manually
logrotate -f /etc/logrotate.conf
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 * * * *'