100 Essential Linux Shell Commands Every Sysadmin Should Know

Shell is the primary interface for interacting with Linux, Unix, and other Unix‑like operating systems, and it also serves as a powerful scripting environment. Familiarity with common shell commands is essential for system administration and automation.

File operation commands

ls

: List directory contents. Example:

ls /home

cd

: Change the current directory. Example:

cd /home/user/Documents

cat

: Display the contents of a file. Example:

cat /etc/passwd

more

: View a file with pagination. Example:

more /var/log/syslog

less

: View a file with reverse pagination. Example:

less /var/log/syslog

touch

: Create an empty file or update a file’s timestamps. Example:

touch /home/user/newfile.txt

Other command categories covered

Search commands (e.g., find, grep)

Directory operation commands (e.g., mkdir, rmdir)

Permission operation commands (e.g., chmod, chown)

Network operation commands (e.g., ping, ifconfig, netstat)

Process and system control commands (e.g., ps, top, kill)

Text operation commands (e.g., sed, awk)

Compression and decompression commands (e.g., tar, gzip, unzip)

Disk usage management commands (e.g., df, du)

Package management commands (e.g., apt, yum, pacman)

Process management commands (e.g., bg, fg, jobs)

Environment variable commands (e.g., export, env)

System information publishing commands (e.g., uname, uptime)

System control commands (e.g., shutdown, reboot)

Text editor commands (e.g., vi, nano)

Other common commands

Each command is introduced with a concise description and a usage example, providing a practical reference for beginners and experienced users alike.