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Full Discussion: Perl error checking question
Top Forums Shell Programming and Scripting Perl error checking question Post 302234841 by i9300 on Wednesday 10th of September 2008 01:39:16 PM
Old 09-10-2008
Perl error checking question

I am not very good with perl but trying to force myself to start learning...
I have a script that calls three other scripts in variables. I want to use a if statement to check the exit status and not sure how to do it..


This is basically what I have, the individual scripts print either a Y or N.
Code:
        $COMMAND1=`command1`;
        $COMMAND2=`command2`;
        $COMMAND3=`command3`;
        if ($COMMAND1 eq "N" || ($COMMAND2 eq "N" || ($COMMAND3 eq "N" ) {
                print "something here";
        } else {
                print "something else";
        }

This works, but I don't like it and it should be done with the exit status. I was reading up on this site....
Perl Special Variables

"$! When used in a numeric context, holds the current value of errno. If used in a string context, will hold the error string associated with errno.
$@ Holds the syntax error message, if any, from the last eval() function call."

I am just not sure how to implement it.
 

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MboxParser::Mail::Body(3pm)				User Contributed Perl Documentation			       MboxParser::Mail::Body(3pm)

NAME
Mail::MboxParser::Mail::Body - rudimentary mail-body object SYNOPSIS
use Mail::MboxParser; [...] # $msg is a Mail::MboxParser::Mail my $body = $msg->body(0); # or preferably my $body = $msg->body($msg->find_body); for my $line ($body->signature) { print $line, " " } for my $url ($body->extract_urls(unique => 1)) { print $url->{url}, " "; print $url->{context}, " "; } DESCRIPTION
This class represents the body of an email-message. Since emails can have multiple MIME-parts and each of these parts has a body it is not always easy to say which part actually holds the text of the message (if there is any at all). Mail::MboxParser::Mail::find_body will help and suggest a part. METHODS
as_string ([strip_sig => 1]) Returns the textual representation of the body as one string. Decoding takes place when the mailbox has been opened using the decode => 'BODY' | 'ALL' option. If 'strip_sig' is set to a true value, the signature is stripped from the string. as_lines ([strip_sig => 1]) Sames as as_string() just that you get an array of lines with newlines attached to each line. NOTE: When the body is actually some encoded binary data (most commonly such a body is base64-encoded), you can still use this method. Then you wont really get proper lines. Instead you get chunks of binary data that you should concatenate as in my $binary = join "", $body->as_lines; If 'strip_sig' is set to a true value, the signature is stripped from the string. signature Returns the signature of a message as an array of lines. Trailing newlines are already removed. $body->error returns a string if no signature has been found. extract_urls extract_urls (unique => 1) Returns an array of hash-refs. Each hash-ref has two fields: 'url' and 'context' where context is the line in which the 'url' appeared. When calling it like $mail->extract_urls(unique => 1), duplicate URLs will be filtered out regardless of the 'context'. That's useful if you just want a list of all URLs that can be found in your mails. $body->error() will return a string if no URLs could be found within the body. quotes Returns a hash-ref of array-refs where the hash-keys are the several levels of quotation. Each array-element contains the paragraphs of this quotation-level as one string. Example: my $quotes = $msg->body($msg->find_body)->quotes; print $quotes->{1}->[0], " "; print $quotes->{0}->[0], " "; This should print the first paragraph of the mail-body that has been quoted once and below that the paragraph that supposedly is the reply to this paragraph. Perhaps thus: > I had been trying to work with the CGI module > but I didn't yet fully understand it. Ah, it is tricky. Have you read the CGI-FAQ that comes with the module? Mark that empty lines will not be ignored and are part of the lines contained in the array of $quotes->{0}. So below is a little code-snippet that should, in most cases, restore the first 5 paragraphs (containing quote-level 0 and 1) of an email: for (0 .. 4) { print $quotes->{0}->[$_]; print $quotes->{1}->[$_]; } Since quotes() considers an empty line between two quotes paragraphs as a paragraph in $quotes->{0}, the paragraphs with one quote and those with zero are balanced. That means: scalar @{$quotes->{0}} - DIFF == scalar @{$quotes->{1}} where DIFF is element of {-1, 0, 1}. Unfortunately, quotes() can up to now only deal with '>' as quotation-marks. VERSION
This is version 0.55. AUTHOR AND COPYRIGHT
Tassilo von Parseval <tassilo.von.parseval@rwth-aachen.de> Copyright (c) 2001-2005 Tassilo von Parseval. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
perl v5.12.3 2005-12-08 MboxParser::Mail::Body(3pm)
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