PATH variable management in Linux CLI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the PATH variable in Linux?

The PATH variable is a list of directories that the shell searches to find executable programs when you type a command.

beginner

How do you view the current PATH variable in a Linux shell?

You can view it by typing echo $PATH in the terminal.

beginner

How do you add a new directory to the PATH variable temporarily?

Use export PATH=$PATH:/new/directory/path. This adds the directory for the current session only.

intermediate

How can you permanently add a directory to PATH for your user?

Add the export command to your shell's config file like ~/.bashrc or ~/.zshrc. For example: export PATH=$PATH:/new/directory/path.

intermediate

Why should you add new directories to the end of PATH instead of the beginning?

Adding to the end avoids overriding system commands. If you add to the beginning, your commands might replace standard ones, which can cause unexpected behavior.

What command shows the current PATH variable?

A echo $PATH

B print PATH

C show path

D list $PATH

The command echo $PATH prints the current PATH variable.

How do you temporarily add /usr/local/bin to PATH?

A export PATH=$PATH:/usr/local/bin

B export PATH=/usr/local/bin

C set PATH=/usr/local/bin

D add PATH /usr/local/bin

Use export PATH=$PATH:/usr/local/bin to add it temporarily.

Where do you add PATH changes to make them permanent for your user?

A /tmp

B /etc/passwd

C /usr/bin

D ~/.bashrc or ~/.zshrc

User shell config files like ~/.bashrc or ~/.zshrc are used for permanent PATH changes.

What happens if you add a directory to the beginning of PATH?

A It has no effect

B It slows down the shell

C Commands in that directory override others

D It deletes other PATH entries

Directories at the beginning of PATH have priority, so their commands override others.

Which symbol is used to separate directories in PATH?

A ,

B :

C ;

D /

Directories in PATH are separated by colons (:).

Explain how to add a directory to your PATH variable temporarily and permanently.

Think about session vs config files.

Why is the order of directories in PATH important? Give an example.

Consider command priority and safety.