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Daily Linux trouble shooting commands

Get a list of running processes

ps aux

Filter through the processes replace "<keyword>"

ps aux| grep <keyword>

Search for 2 or more processes

ps aux| egrep '<keyword1>|<keyword2>|<keyword3>'

Show running processes using top

top -c

Or use htop

To check if a port is occupied, and by which process

lsof -i :80
ss -patun| grep -w 80

Read about SAR for understanding cpu avg over time etc. Install atop to monitor historic events

To check disk usage Overall disk usage

df -Th

Top 10 files

du -ach --max-depth=1 / | sort -rh | head -n10

Change password

passwd username

Reset MySQL root password

Reboot a server

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