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There are plenty of materials online that would help you to master these commands and its various options. This list will tell you what commands you should start looking up.
- ls
- List files in current directory
- ls -l Lists files in “long” format
- ls –a List all files, including “hidden” files.
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- mkdir
- Make Directory. Example: mkdir /tmp/myfiles/
- rmdir Remove Directory. Example: rmdir /tmp/myfiles/
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- scp
- secure copy (remote file copy program)
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- chkconfig
- updates and queries runlevel information for system services
- service start|stop|status
- who
- whoami
- useradd
- passwd
- sudo
- ssh
- ping