Linux Cheatsheet

An empty repo containing a list of useful Linux commands

Navigating and Working with Files

• cd - change directory
• ls - list files, see list of options
• touch - create a file
• nano - edit file
• cp <origin> <destination> - copy
• mv <origin> <destination> - move
• rm <filename> - remove
• mkdir - create directory
• rmdir - remove directory
• cat - display content of a file

Saving Results to a File

• output > filename - wipes content and writes output
• output >> filename - adds output to the existing content of the file

Searching and comparing files

• grep keyword <filename> - lists search results after the keyword in a specific file
• diff file1 file2 - lists the differences between the 2 files

Verifying Files Using Checksum

• sha1sum <filename>

Compress and Extract tar and gz Files

• gzip <filename> - compress file

• gunzip <filename> - uncompress files

• tar cvf <targetfilename> <list of files> - compress a list of files into an archive

• tar xvf <archivename> - uncompresses the archive

Install Software with APT apt-get

• sudo apt-get update - update the advance package manager

• sudo apt-get install <packagename> - install the specified package

• bash <scriptname> - run shell scripts

• apt-get search <package-name-query> - lists all the available packages with similar names as the query

Users

• sudo useradd <username> - create user
• sudo passwd <username> - set user password

Groups

• sudo groupadd <groupname>
• sudo usermod -a -G <groupname> <username>
• sudo userdel <username>

SSH

Connect to Server

• ssh <username>@<ip_address> - connects to the specified address with username

SSH Key Authentication

• ssh-keygen -t rsa - generate public / private rsa key pair
• ssh-copy-id root@serveraddress - adding ssh key to server

SFTP

• sftp <username>@<ip_address> - connects to remote machine with SFTP enabled
• put <path/filename> - uploads a file to the working directory
• put -r <foldername> - uploads a folder to the working directory
• get <filename> - downloads a file from server
• get -r <foldername> <destination> - downloads a folder from the server

Processes & Jobs

• ps - list all your processes
• ps ax - list all system processes
• <program_name> & - runs the program in the background
• jobs - list of jobs running
• fg %<job number> - brings job to foreground
• CTRL+C - terminates a process
• CTRL+Z - pauses a process
• kill PID - kill process directly
• kill -STOP PID - stops a process
• kill -CONT PID - resumes a process