Linux Basic Commands - CodeSwordsman

Print the absolute path of the current directory

List all files including hidden ones, with human-readable sizes

Change into a directory; cd - returns to the previous one

Copy a directory recursively

Move or rename a file

Force-delete a directory recursively; double-check the path first

Create nested directories, creating parents as needed

Create a symbolic link, commonly used for version switching

Find log files modified more than 7 days ago

Show directory sizes sorted by size

Show OS release information

Page through a large file; press / to search and q to quit

Follow the last 200 lines of a log in real time

Show the first 50 lines of a file

Search a directory recursively with line numbers

Locate a command and show its version

Set mode 755: owner read/write/execute, others read/execute

Apply permissions recursively to a directory

Change owner and group recursively

Create a user with a home directory and bash shell

Change the password of a user

Show current UID, GID and group memberships

Show running processes matching a keyword

Print a one-shot snapshot of top CPU/memory processes

Gracefully terminate a process; -9 forces a kill and may lose data

Check service status and recent log lines

Enable at boot and start the service now

Follow the last hour of logs for a service

Show memory and swap usage

Show disk usage and filesystem types

Show uptime and load average

Show network interfaces and IP addresses

List listening TCP/UDP ports with processes

Send 4 ICMP packets to test connectivity

Fetch response headers only to check availability

Copy a directory over SSH recursively

Log in to a remote host on a specific port

Create a gzip-compressed tarball

Extract into a target directory

List archive contents without extracting

Create a zip archive for Windows compatibility