I have the following code:

    #!/usr/bin/perl -w
    use warnings;
    use diagnostics;
    
      open $fh , "<", "$ARGV[0]" or die "Could not open file: $!";

      sub getsub{
        my $sub = $_[0];
        print "sub entered for $sub\n";
        while (<$fh>) {
        if (/\.subckt $sub/../\.ends/) {
          print ;
        }
      }
    }

    while  (<$fh>) {
      if ($_ =~ /^xa1/) {
        $line = $_;
        print "line found to be $line\n";
        while ((my $nxt = readline($fh)) =~ /^\+/) {
          $line = $nxt;
          print "line changed to $line\n";
        }
        $line =~ s/\s+$//;
        print  "last line is $line\n";
        my $sub = (split '\s', $line)[-1];
        print "subcircuit found is $sub in $line\n"; 
        getsub($sub);
      }
    }
[download]

Here I am trying to print some text between two patterns inside the `getsub` routine. But when I try to run this I enter the subroutine but doesn't enter the if block inside the subroutine. I am trying to run it on the following file:

     .subckt a1 x y z
       xa a b c1
       xb c d e1
       xc f g h1
     .ends

     .subckt c1 x y z
      xa a b f
      xb c d e
      xc f g h
    .ends

    .subckt e1 x y z
      xa a b c1
      xb c d k1
      xc f g h1
    .ends

    xa1 a s f a1
[download]

I want to print the contents of the file between ".subckt a1" till ".ends".
I know this could be done by the one liners of perl on the command line, but I want to create some generalized script for different files so I need to go this way only. What is wrong with the above code.

---

---

• Are you posting in the right place? Check out Where do I post X? to know for sure.
• Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:

  <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>

• Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.