Best Fixes
Identify the process still using the file, then stop it or replace the file via a safer deploy pattern.
Use atomic moves or versioned artifacts instead of overwriting an actively used executable in place.
Error Fix
How to Fix 'Text file busy'
Why Linux blocks execution or replacement of a file in use and how to recover cleanly.
This usually happens when you try to overwrite or execute a file while another process still has it open in a way the system will not allow. It is common in deploy and build scripts.
Avoid This
Do not retry blindly if your deploy process is racing with a live process.
Do not patch around the issue without understanding which process still owns the file.
Save commands, add notes, and build a Cheatbook with the fixes you want to keep handy.