[CentOS] perl one-liner issue

[Jason Pyeron]

> -----Original Message-----
> From: Benjamin Franz
> Sent: Wednesday, March 16, 2011 17:30
> To: CentOS mailing list
> Subject: Re: [CentOS] perl one-liner issue
> 
> On 03/16/2011 01:42 PM, Joseph L. Casale wrote:
> >>> $conf['nagios_base'] =
> >> I'd just search for that part, above.
> > Me to, and I never even got to the replacement as the 
> search for that 
> > was bailing:)
> 
> The problem is trying to pass valid Perl though the bash 
> shell . There is an insane amount of interaction between all 
> the escapings involved in this specific pattern. The hard 
> problem is getting bash to *not* change what you are passing 
> to Perl before Perl sees it.
> 
> Use 'echo' as a stand-in for Perl and you will see what is 
> actually being passed to Perl for execution (it most likely 
> isn't what you think it is). Once you know you are feeding 
> Perl the right thing, you can worry about getting the pattern 
> for the substitution correct.
> 
> After enough poking and prodding you'll get something like 
> this (after giving up on getting bash to not molest the ' 
> characters before passing them to Perl):


'this string isn'"'"'t escaped \n\n :) '

I got used to this a long time ago...

> 
> 's/(\$conf\[\047nagios_base\047]\s*=\s*")\/nagios\/cgi-bin";/$
1stuffhere"\;/'
> 
> Is there some reason you can't use a straight Perl script 
> instead of using bash to run a perl one liner?
> 

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