Basic Commands
- pwd : print working directory
- ls: list directory contents
- cd: change directory
- mkdir : creates a directory
- mv : moves a file
- cp : copies a file
- rm : removes a file
- cat : view contents of a file
- less : view contents of a file one page at a time
- more : view contents of a file one page at a time
- grep : search for text within files
- find : search for files
- chmod : change file/directory permissions
- man : view help/manual page for a command
Network and Security:
- ping : send ICMP echo request to host
- traceroute : show path of network hops
- netstat : show routing table and active connections
- nmap : Network Mapper (scanner)
- ifconfig : view/modify network interfaces
- tcpdump : capture network traffic
- wireshark : graphical network traffic analyzer
- arp : view arp table
- SSH : secure remote login
- WEP/WPA : wireless encryption protocols
- iptables : configure Linux firewall
- nessus : vulnerability scanner
System Administration
- df : shows free/used disk space
- free : shows free/used system memory
- top : show running processes
- ps : show running processes
- uname : show system information
- uptime : show system uptime
- init : manage system run levels
- chown : change file/directory ownerships
- crontab : manage cron jobs
- useradd : add new user
- userdel : delete user
- groupadd : add new group
- groupdel : delete group
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