What is the 'PATH' environment variable?

The PATH environment variable in Linux is a crucial system variable that specifies a list of directories where the operating system looks for executable files when a command is entered in the terminal. It allows users to run programs without needing to specify their full path.

Key Points:

• Structure: The PATH variable contains a colon-separated list of directory paths. For example:

  /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

• Execution: When you type a command, the shell searches through each directory listed in the PATH variable in order until it finds the executable file that matches the command.

• Modification: You can modify the PATH variable to include additional directories where your custom scripts or programs are located. For example:

  export PATH="$PATH:$HOME/my_scripts"

• Verification: You can check the current value of the PATH variable by running:

  echo $PATH

The PATH variable is essential for efficient command execution and helps streamline the use of various applications and scripts in the system.