Your file has a bunch of binary carriage returns in it. Looks like you did not correctly transfer the file from a non-Unix OS to Unix (or vice-versa) in ASCII form. The problem occurs because *with* the -w flag, the carriage return can be safely ignored by Perl, however, without it, your line looks something like this: 
#!/usr/bin/perl^M

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Since the carriage return has to be treated as if it were a normal ASCII byte, it's looking for the binary perl^M to execute your script, not perl. Thus, you get "not found".

The fix: Transfer the file again correctly, dropping the carriage returns. Alternatively, you can use the search/replace feature in, say, vi, to strip them out: :%s/^V^M//g (where the ^V is a control-V (quote the next character) and the ^M is a control-M), or use something similar in a Perl one-liner.

In reply to Re: -w more than a warning? by Fastolfe
in thread -w more than a warning? by jptxs

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