perl script wont run unless I use perl prefix

guygrinberger

2/7/24, 11:04 AM

I have a weird problem trying to run a simple perl script on ubuntu 22.04.

test.pl content:

#!/usr/bin/perl
print "Hello\n";

output of which perl command:

/usr/bin/perl

I used to run scripts with just their path, but now I get permission denied when doing so, unless I use the perl prefix.

distcc@a172-24-178-137:~$ ./test.pl
bash: ./test.pl: Permission denied
distcc@a172-24-178-137:~$ perl ./test.pl
Hello

Permissions look fine to me:

distcc@a172-24-178-137:~$ ls -l test.pl
-rwxr-xr-x 1 distcc staff 33 Feb  6 17:07 test.pl

what is causing the problem?

0 + 4

permissions

scripts

perl

22.04

DrHyde

2/7/24, 12:26 PM

I wonder if an invisible character has snuck into the shebang line. Can you show us the output from `hexdump -C test.pl` please.

Kyle

2/7/24, 12:45 PM

The size of the file (33 bytes) matches the clean version I made locally. There's no invisible character. That error looks like this: `bash: ./test.pl: /usr/bin/perl^M: bad interpreter: No such file or directory`

Kyle

2/7/24, 1:05 PM

A related post from the sidebar seems to have the answer. Perhaps [the filesystem is mounted with 'noexec'](https://askubuntu.com/questions/1346733/bash-script-permission-denied-when-tying-to-run).

guygrinberger

2/7/24, 2:31 PM

@Kyle you are right, that was the case. a bit different on 22.04 but same root cause.

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EN: perl script wont run unless I use perl prefix

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