List cron jobs (system)

List all system and user cron job locations

ls /etc/cron.* /var/spool/cron/crontabs/

More linux commands

Show environment variables

printenv | sort

Display all environment variables sorted alphabetically
Watch disk I/O

iostat -xz 1

Show extended disk I/O statistics updated every second
Show process tree

pstree -p

Display process hierarchy with PIDs
TCP/IP tuning — backlog

sysctl -w net.core.somaxconn=65535

Increase the maximum connection backlog for sockets
Show CPU info

lscpu

Display CPU architecture and core count information