Follow multiple log files

Stream multiple log files interleaved in one terminal

tail -f /var/log/syslog /var/log/auth.log

More linux commands

Search compressed logs

zgrep -i 'error' /var/log/syslog.*.gz

grep inside .gz files without manual decompression
Rotate logs manually

logrotate -f /etc/logrotate.conf

Force log rotation regardless of schedule
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

Print active cron lines for every user
Cron expression tester

systemd-analyze calendar '*/5 * * * *'

Parse and show next 5 trigger times for a cron expression
Redirect stderr to file

command > /tmp/out.log 2> /tmp/err.log

Split stdout and stderr into separate files