PATH (Environment Variable)
A list of directories your computer searches when you type a command — if Python or Git says 'command not found', PATH is usually why.
January 15, 2026
What PATH Is
When you type python in your terminal, your computer doesn't search your entire hard drive for a program named "python." Instead, it looks through a specific list of folders — that list is the PATH environment variable.
PATH is just a list of directory locations separated by colons (Mac/Linux) or semicolons (Windows). Your operating system checks each folder in order until it finds a matching program, or gives up with "command not found."
Why "Command Not Found" Happens
When you install a program like Python or Git and then see command not found in the terminal, it almost always means the installer put the program's files somewhere that isn't in your PATH. The program is installed — your terminal just doesn't know where to look for it.
Most modern installers handle this automatically, but sometimes they ask if you want to "add to PATH" — always say yes.
How to Check Your PATH
On Mac/Linux:
echo $PATH
On Windows (PowerShell):
echo $env:PATH
This prints the full list of directories your system searches.
How to Fix a Missing PATH Entry
If a tool isn't found after installation, the fix is usually to add the install location to your PATH. The exact steps depend on your operating system, but a quick search for "add Python to PATH on [your OS]" will give reliable instructions.
Understanding PATH saves you from a lot of mysterious setup frustration when starting out with developer tools.
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