This is my on-going cheat sheet of Linux commands for my Plesk server running on CentOS 5. I will keep updating this as I go on. Read more to see the list:

Restarting Firewall

• /etc/rc.d/init.d/psa-firewall stop
• /etc/rc.d/init.d/psa-firewall start

Restart Plesk

• /etc/init.d/psa stop
• /etc/init.d/psa start

Restart MySQL

• /etc/init.d/mysqld restart

Optimize all MySQL databases and tables

• mysqlcheck -Ao -u username -ppassword (Optimize all)
• mysqlcheck -Aa -u username -ppassword (Just analyze)
• mysqlcheck -Aao -auto-repair -u username -ppassword (Analyze, repair and optimize)

Run Logwatch

• logwatch –print –detail High –archives –range All

Change Ownership

• chown user:group /some/folder
• chown user:group /some/folders-and-the-files-inside/*

Copy Contents of a Folder to Another

• cp -r /some/folders-and-the-files-inside/* /some/folder

Check Sub-folder Sizes in the Current Folder

• du -sh *

Check Total Size of a Folder

• du -sh

List Partitions and Drive Space Usage

• df -k

Splunk Commands

• /opt/splunk/bin/splunk stop