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Today I came upon a quirk (bug?) of shebang/hash-bang line argument parsing. Past experience (and perlrun) tells me that perl (lowercase) parses commandline options from the shebang line:

$ cat #!/usr/bin/perl print "foo"; $ cat #!/usr/bin/perl -l print "foo"; $ perl -l foo $ perl foo $ ./ foo $ ./ foo$ # note the lack of a newline

So, why do I get the wide-character warning in the following:

$ cat #!/usr/bin/perl -l print "\x{101}"; $ cat #!/usr/bin/perl -l -CDS print "\x{101}"; $ perl -l -CDS -e 'print "\x{101}"' $ perl -CDS $ perl Wide character in print at line 2. $ ./

Even more mysteriously, it seems the -CDS is getting applied (as seen by testing ${^UNICODE}), but not to STDOUT:

$ cat #!/usr/bin/perl -l -CDS print ${^UNICODE}, ' ', "\x{101}" $ perl Wide character in print at line 2. 31 $ perl -CDS 31

Is this a bug? If so, is it merely a documentation bug? (need a warning that -C doesn't get applied in time to affect STD(IN|OUT|ERR) if it's in a shebang?)

$ perl -v This is perl, v5.8.8 built for i686-linux

In reply to Bug in perl -C (Unicode) option parsing? by benizi

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