Hello again, jesuashok,
I'm not sure why you think it's strange behaviour; it seems logical to me.
You are putting $0 (the name of the current file) into @ARGV, and then reading from that file. When you close the file with close ARGV, you've already read one line, which is in $_. So when you do:
print '.',$_;
you are simply printing out a period '.', concatenated with the first line of the Perl script itself.
Try taking out the line close ARGV; and the whole program will be printed:
#!/usr/bin/perl -w
use strict; use warnings;
#prints one line and bails out
@ARGV = ( $0 );
while (<>) {
# close ARGV;
print $_;
}
# Output
#!/usr/bin/perl -w
use strict; use warnings;
#prints one line and bails out
@ARGV = ( $0 );
while (<>) {
# close ARGV;
print $_;
}
s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/
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