.local/bin/fnx: 17: [: unexpected operator

[strika]

This is what I get right after installing fnx.

❯ fnx
/home/user/.local/bin/fnx: 17: [: unexpected operator
Welcome to Fennel 1.2.1 on PUC Lua 5.3!
Use ,help to see available commands.
Try installing readline via luarocks for a better repl experience.
>> 

If I change the shebang in the script from #!/usr/bin/env sh to #!/usr/bin/env bash, I can use fnx.

Anything I can do to provide you more information?

[erikLundstedt]

try running file $(which sh) and file $(which bash)
on my system(arch/archcraft) it is symlinked to bash

file $(which sh)
##;; -->/usr/bin/sh: symbolic link to bash

sidenote
bash, when executed as sh will run in a special mode according to the manpage:

If bash is invoked with the name sh, it tries to mimic the startup behavior of historical versions of sh as closely as possible,
while conforming to the POSIX standard as well

$ man bash

on debian/ubuntu, it might be symlinked to debians dash
on some systems it might be installed as its own thing(not symlinked)

if just using #!/usr/bin/env bash works, I dont see much issue with using it like that.