On 20/11/2018 21:56, Dan Kegel wrote:
I was surprised to discover that:
touch foo
chmod +x foo
./foo
echo $?
outputs
0
on the linux, mac, and bsd systems I've tried; on Linux I tried both
bash and dash.
Is this expected? I did a quick scan of the standard but didn't see
anything related.
It's not specified directly, but if the shell attempts to execute a file
that execl() rejects with ENOEXEC, and the file is a text file that does
not start with #!, the standard requires it to be interpreted as a shell
script. An empty file is a valid text file, so must be treated as an
empty shell script.
Thanks,
Dan
