- Linux file system structure
- man
- ls
- who, whoami
- file types in linux
- pwd
- cd
- logname
- cat
- Input and output redirection
- cp
- rm
- mv
- wc
- cmp
- comm
- diff
- tr
- chmod
- mkdir
- rmdir
- pipe symbol
- echo
- export
- source
- xargs
- wget
- curl
- ping
- cron
- tar
- basename
- head
- tail
- cut
- sort
- uniq
- tee
- find
- grep
- ps
- kill
- nohup
- top
- netstat
- nslookup
- ifconfig
- useradd
- passwd
- usermod
- userdel
- groupmod
- groupdel
- getent