Shebang option ‘ #!/bin/csh -f ‘

What does the Shebang option -f do? How do I find, or man, detailed explanations on all Shebang options?

#! /bin/csh -f

Answer

There aren’t any “shebang options”.

Any options there are options to the binary in the shebang.

So that’s a csh option.

Specifically (from the man page):

-f

The shell will start faster, because it will neither search for nor execute commands from the file .cshrc in the invoker’s home directory. Note: if the environment variable HOME is not set, fast startup is the default.