Backslash is an escape character which needs to be escaped ... you might already guess ... with a backslash.

The shell doesn't act very different to double-quoted strings in Perl.

UPDATE

You have a misconception here

> With MS Windows's cmd.exe shell we can force an exception if any args passed via the command line contain a backslash:

the same with Unix, just

> So ... if someone does perl script.pl arg\one in one of these shells, is there any way that script.pl can detect the backslash contained in that command line argument ?

In your example you are not passing a backslash, just an escaped "o", which is most probably just a simple "o"¹. To be able to pass a backslash you need to double it!!!

Cheers Rolf

( addicted to the Perl Programming Language)

¹) yep 

lanx@nc10-ubuntu:~$ perl -le 'print ord(chomp($ARGV[0]))' \o
48
lanx@nc10-ubuntu:~$ perl -le 'print ord(chomp($ARGV[0]))' o
48

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In reply to Re: [SHELL] Detect backslash in command line args by LanX
in thread [SHELL] Detect backslash in command line args by syphilis

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