CentOS - Mar 2011 - perl one-liner issue

I am trying to deduce the one liner for an rpm I am packaging to edit a php
configuration file from within my spec. The line I am editing looks like:

$conf['nagios_base'] = "/nagios/cgi-bin";

What are the escape requirements Perl needs from within the shell to
search for this?

As I have seen, the syntax is a mess, any pointers would be appreciated!
thanks,
jlc

On 03/16/11 12:56 PM, Joseph L. Casale wrote:
> $conf['nagios_base'] 
I'd just search for that part, above.

On Wed, Mar 16, 2011 at 07:56:41PM +0000, Joseph L. Casale
wrote:
> I am trying to deduce the one liner for an rpm I am packaging to edit a php
> configuration file from within my spec. The line I am editing looks like:
> 
> $conf['nagios_base'] = "/nagios/cgi-bin";
> 
> What are the escape requirements Perl needs from within the shell to
> search for this?
> 
> As I have seen, the syntax is a mess, any pointers would be appreciated!
Go easy on yourself, and :
a) don't try to match the quotation marks verbatim.  Instead, match them
with simply a .
b) use parenthesis to 'remember' a pattern that you don't want to
have
to specify again.

E.g. to replace the path on the right-hand-side, do this:
(i replaced it with a /; you could of course replace it with whatever
you want)

perl -i -ne 's/(^\s*\$conf\[.nagios_base.] = ).\/nagios\/cgi-bin.;/$1
\"\/\";/; print;' phpConfigFileName

E.g. to delete the line outright:
perl -i -ne 'print unless /^\s*\$conf\[.nagios_base.] =
.\/nagios\/cgi-bin.;/;' phpConfigFileName

Cheers,

Jon

From: Joseph L. Casale <jcasale at activenetwerx.com>
> To: "centos at centos.org" <centos at centos.org>
> Sent: Wed, March 16, 2011 8:56:41 PM
> Subject: [CentOS] perl one-liner issue
> 
> I am trying to deduce the one liner for an rpm I am packaging to edit a 
php
> configuration file from within my spec. The line I am editing looks  like:
> $conf['nagios_base'] = "/nagios/cgi-bin";
A sed alternative:

  sed -i '/nagios_base/ s/\/nagios\/cgi-bin/xxx/' $FILE
or more selective:
  sed -i '/$conf\[.nagios_base.\] = / s/\/nagios\/cgi-bin/xxx/' $FILE

JD