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Full Discussion: Perform an action if certain text exist in output (PERL)
Top Forums Shell Programming and Scripting Perform an action if certain text exist in output (PERL) Post 302777349 by Corona688 on Thursday 7th of March 2013 05:19:06 PM
Old 03-07-2013
When most of your "perl" is shell statements in backticks, you're fighting the language. Each individual set of backticks is its own independent shell anyway, you might as well use one shell instead of thirty.

Code:
#!/bin/sh

while read LINE
do
        # This works for Linux ping.
        # Solaris ping just prints 'x is alive' all by itself
        # others may vary.
        if ping -c 1 $LINE
        then
                echo "$LINE is alive"
        else
                echo "Couldn't ping $LINE"
        fi
done

I feel your pain, I learned Perl first too, but trying to use it as a shell just makes ugly code -- you'll spend most of your time, effort, and code getting things in and out of shell.

Strip out the perl, keep the shell, and you can do the same job faster in half the code.

You might find it better to process ping's output than nslookup's output, they both look up domain names.
Last edited by Corona688; 03-07-2013 at 06:25 PM..
 

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LEARN ABOUT CENTOS

mail::spf::mech::ptr

Mail::SPF::Mech::PTR(3) 				User Contributed Perl Documentation				   Mail::SPF::Mech::PTR(3)

NAME

       Mail::SPF::Mech::PTR - SPF record "ptr" mechanism class

DESCRIPTION

       An object of class Mail::SPF::Mech::PTR represents an SPF record mechanism of type "ptr".

   Constructors
       The following constructors are provided:

       new(%options): returns Mail::SPF::Mech::PTR
	   Creates a new SPF record "ptr" mechanism object.

	   %options is a list of key/value pairs representing any of the following options:

	   qualifier
	   domain_spec
	       See "new" in Mail::SPF::Mech.

       new_from_string($text, %options): returns Mail::SPF::Mech::PTR; throws Mail::SPF::ENothingToParse, Mail::SPF::EInvalidMech
	   Creates a new SPF record "ptr" mechanism object by parsing the string and any options given.

   Class methods
       The following class methods are provided:

       default_qualifier
       qualifier_pattern
	   See "Class methods" in Mail::SPF::Mech.

       name: returns string
	   Returns 'ptr'.

       name_pattern: returns Regexp
	   Returns a regular expression that matches a mechanism name of 'ptr'.

   Instance methods
       The following instance methods are provided:

       text
       qualifier
       params
       stringify
	   See "Instance methods" in Mail::SPF::Mech.

       domain_spec: returns Mail::SPF::MacroString
	   Returns the "domain-spec" parameter of the mechanism.

       match($server, $request): returns boolean
	   Checks whether the mechanism's target domain name, or a sub-domain thereof, is a "valid" domain name for the given request's IP address
	   (see "ip_address" in Mail::SPF::Request), and returns true if it does, or false otherwise.  See "valid_domain_for_ip_address" in
	   Mail::SPF::Util for how domains are validated.  See RFC 4408, 5.5, for the description of an equivalent algorithm.

SEE ALSO

       Mail::SPF, Mail::SPF::Record, Mail::SPF::Term, Mail::SPF::Mech

       <http://tools.ietf.org/html/rfc4408>

       For availability, support, and license information, see the README file included with Mail::SPF.

AUTHORS

       Julian Mehnle <julian@mehnle.net>, Shevek <cpan@anarres.org>

perl v5.16.3							    2014-06-10						   Mail::SPF::Mech::PTR(3)
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