Shell scripts I come across sometimes have for instance “
#!/bin/bash -eux” on the first line. Because I’ve Googled for this too many times
now, I’ll record the meaning of these options here for my own sanity.
The options (
-x) are part of the
set builtin. They
have the following meaning:
- Exit immediately if a pipeline […] returns a non-zero status.
- Treat unset variables and parameters […] as an error when performing parameter expansion.
- Print a trace of […] commands and their arguments or associated word lists after they are expanded and before they are executed.
For more details and other options, read the manual.