Perl makes this even easier if the script is in a file... read from
filehandle 0 (stdin for perl.exe as opposed to <> which will be your
terminal rather than stdin).
---cut---
$x=q/test test test/;
open 0 or die('eek');
undef $/;
$a=<0>;
close (0);
print $a;
print "\n$x\n";
---cut---
Kind regards,
Mark Anderson
Service Improvement Programme
Level 2, 113 Dundas Street
Edinburgh, EH3 5DE
Tel: 0131 523 8786
Mob: 07808 826 063
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [SMTP:[EMAIL PROTECTED] On Behalf Of
> Gardner, Sam
> Sent: Tuesday, May 31, 2005 1:58 PM
> To: '[EMAIL PROTECTED]'; Perl Mailing List
> Subject: RE: Script printing its own source code
>
> *** WARNING : This message originates from the Internet ***
>
>
>
> 1) Hmmmm. . . Did you chomp?
>
> 2) I don't think there's any problem at all with a script opening itself
> as a text file. Keep in mind that when it's running it's been interpreted
> and is in memory (so no file sharing issue). It could, of course, destroy
> or modify itself. Whether you think that's a good thing or not depends on
> the purpose and methods of your script.
>
> Sam Gardner
>
> GTO Application Development
>
> Keefe, Bruyette & Woods, Inc.
>
> 212-887-6753
>
>
>
>
>
> -----Original Message-----
> From: Ted Schuerzinger [ <mailto:[EMAIL PROTECTED]>]
> Sent: Saturday, May 28, 2005 1:05 PM
> To: Perl Mailing List
> Subject: Script printing its own source code
>
>
> Over on rec.puzzles on Usenet (<[EMAIL PROTECTED]>), somebody
>
> posted a puzzle asking about using programming languages to print out a
> program's own source code. So, I quickly whipped up the following 11-line
>
> script in Perl:
>
> <snip>
> #! perl -w
>
> use strict;
>
> my $selfprint="c:/scripts/selfprint.pl";
>
> open SELFPRINT, "$selfprint" or die "Cannot open $selfprint for read :$!";
>
>
> while (<SELFPRINT>) {
> print;
> }
> </snip>
>
> I opened up the DOS prompt in Windows 98, and ran the script. The result
>
> was the following:
>
> <snip>
> Microsoft(R) Windows 98
> (C)Copyright Microsoft Corp 1981-1999.
>
> C:\WINDOWS>cd\scripts
>
> C:\scripts>perl selfprint.pl
> #! perl -w
>
> use strict;
>
> my $selfprint="c:/scripts/selfprint.pl";
>
> open SELFPRINT, "$selfprint" or die "Cannot open $selfprint for read :$!";
>
>
> while (<SELFPRINT>) {
> print;
> }
>
> C:\scripts>
> </snip>
>
> Two questions:
>
> 1) When the script prints itself out, it prints an extra blank line before
>
> giving me the command line again. (I've got the script open in my text
> editor, set to show line numbers, and there are definitely only 11
> lines.) Where's the blank line coming from?
>
> 2) Is it really a good idea for a script to be allowed to open itself? I
>
> don't know if I want to try having a script open itself for write, even if
>
> only to see what would happen. :-)
>
> --
> Ted Schuerzinger, [EMAIL PROTECTED]
> _______________________________________________
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