$0 isn't populated on macOS when using -s about entr HOT 5 CLOSED

Cool! Closing

The man page isn't the right place to hilight shell nuances. But I'd be happy to add hints on avoiding shell pitfalls to http://eradman.com/entrproject/

Feel free to suggest a new section or edits to that page.

from entr.

Glad you like it!

It appears that fish -c doesn't set $N based on supplied arguments

$ fish -c 'echo $0' one

Where as bash, ash, ksh, sh do:

$ sh -c 'echo $0' one
one

Does fish use an alternate convention for passing variables?

from entr.

Indeed it does.

fish -c 'echo $argv[1]' one

This works as expected (array indices start at 1 instead of 0).

This still doesn't work though

ls | entr -s "echo $argv[1]"

And neither does the bash equivalent

$ export SHELL=/opt/homebrew/bin/bash
$ ls | entr -s "echo $0"

bash returned exit code 0

bash returned exit code 0

🤔 Is ls | entr -s "echo $0" a valid test for bash/sh/etc? If not, what should I be doing instead?

from entr.

Ah, make sure you use single quotes! When you use double-quotes variables are evaluated before entr runs.

from entr.

@eradman That works! TYSM for helping me debug this. That behavior makes sense in retrospect.

I know what one chooses to include/exclude in the manual page is always a balance, but do you think this single quote caveat might be worth including? (I am happy to concede that the fish-specific behavior is probably not worth including)

from entr.