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#include <stdio.h>
int main(int argc, char* argv[])
...
   for (i = 0; i < argc; ++i) { printf("%d:%s:\n", i, argv[i]); }
   return 0;
}

> arg.exe "abc "" xyz"

0:arg.exe:
1:abc " xyz:

for my $arg (@ARGV) { print "$arg:\n" }

> perl arg.pl "abc "" xyz"

abc ":
xyz:

use strict;
use warnings;
...
$cmdline =~ tr/\0//d;     # remove any NULLs left over from pack Z*
$cmdline =~ s/\s+$//;     # remove trailing white space
print "cmdline=$cmdline:\n";