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Linux Command Cheat Sheet

Resource:

Linux & Docker Fundamentals

Stuck Somewhere?

  • man - If you get stuck anywhere use this man<space>command where you can access the manual of the particualar command!

What is OS info?

  • OS info is a general term that refers to information about the operating system (OS) running on a computer

Commands to get info about OS:

  • lsb_release -a
  • cat /etc/os-release
  • uname -a
  • lscpu
  • lsmem

What is syslog?

  • Syslog is a standard protocol used for collecting and storing log messages generated by various system components, applications, and network devices.

Commands to get info about Syslog:

  • find / -name 'syslog'
  • cd /var/log -> cat syslog -> cat syslog | less (this is used for better representation of logs).

What is creating a new user in linux?

  • Creating a new user in Linux involves setting up a unique account for a specific individual to access the system.

Commands to create a New User:

  • useradd -D - This command tell us the information which is defaut for all users.
  • useradd -m <space> username - This command will create a new user.
  • passwd <space> username - This command will help you to setup password to the particular user. -usermod -aG sudo username - This command will add your particual user to sudo group which will help you to run command as root user.
  • su - username - This command will switch to the particular username.

What are groups in linux?

  • Groups in Linux are essentially collections of users. They're a fundamental part of the operating system's permission structure, making it easier to manage access to files and system resources.

Commands to play around groups:

  • groupadd <space> groupname - This command will help you to create a new group.
  • getent group groupname - This command will help you to get information of that particualar group.
  • sudo -aG groupname $USER - This command will add user to the specific group

File Operations:

  • touch file1 - Create file1
  • cat file1 file2 - Concatinate file and provide ouput.
  • less file1 - View and paginate file1
  • file file1 - Get type of file1
  • cp file1 file2 - Copy file1 to file2
  • mv file1 file2 - Move file1 to file2
  • rm file1 - Delete file1

Directory Operations:

  • pwd - Show current directory
  • mkdir dir - Make directory dir
  • cd dir - Change directory to dir
  • cd .. - Fo up a directory
  • ls - List files

ls operations:

  • -a - Show all files
  • -R - Recursive list
  • -r - Reverse Order
  • -t - Sort by last modified
  • -S - Sort by file size
  • -l - Long listing format
  • -1 - One file per line
  • -m - Comma-seperated output
  • -Q - Quoted output