Best Fixes
Check whether the file needs `chmod +x` or should instead be run as `bash script.sh`, `sh script.sh`, or another interpreter command.
Inspect the shebang and confirm the target interpreter exists on your machine.
Error Fix
How to Fix 'Permission denied' After Downloading a Script
Why downloaded scripts often fail to run and the safest way to execute them.
A downloaded script often lacks execute permission. In other cases, it is meant to be run by an interpreter rather than executed directly. The right fix depends on which one you actually have.
Avoid This
Do not mark unknown downloads executable without understanding what they are.
Do not confuse missing execute permission with broader filesystem ownership issues.
Save commands, add notes, and build a Cheatbook with the fixes you want to keep handy.