Things to remember

To read the complete documentation about how to use any of the linux command, just use man follwed by the command

Example

$ man ls

$ man chown

$ man chgrp

To clear the terminal screen we use clear command to give terminal a clean look. It’s not about deleting files or data, only just resetting the visual display in your terminal.

$ clear

Piping and Redirection:

• > - Redirect output to a file (overwrites).

  $ ls -l > filelist.txt
• >> - Append output to a file.

  $ echo "New line" >> filelist.txt
• | - Pipe output of one command to another.

  $ ls | grep ".txt"

Wildcards and Globbing:

• * - Matches any number of characters.
• ? - Matches exactly one character.

  $ ls *.txt # List all text files
  $ ls file?.txt # Matches file1.txt, file2.txt, etc.

Command History and Shortcuts:

• history - Show command history.
• ! - Execute commands from history.

  $ history
  $ !5 # Execute command number 5 from history