I need a target executable for some test code that exits due to a SIGSEGV

I’m trying to create my own ls command using golnag. I’m using filepath.walk(path) to access files, it shows all the files and folders correctly and in order when using ls. when trying to shows the hidden files it shows them but the order different than ls-a.
for example:
my code shows -> .get a then b
but ls -a -> a then b then .get

I want to run an equivalent to:

I want to run an equivalent to psql -lqt | cut -d | -f 1 | grep -qw ; echo $?

Using Go lang with Linux (ubuntu).