Thank you guys for your fast answers.

Sorry for the html, as i posted it through the backupcentral forum, it modified 
the config part in html, didn't expect that.

Well, i'm gonna look the given solutions to get it work.

Sorry for my confuse question.

I know about the arrays etc. The goal is for me to change settings, even if 
it's a single value, or a complex array by replacing the all param in the 
config file.

I already know how to get a well formed array to reproduce perl's one from bash 
or php.

My first problem was erasing the specific area in the configuration file (only 
the modified value).

I'm gonna try to make :
1 : remove the desired value from config file (by any of the solutions you tell 
me above)
2 : add new configuration in the file (by ex in shell : echo 
"$Conf{FullKeepCnt} = ['400']; ">>/etc/BackupPC/pc/my_config_file.pl  (just to 
tell how i plan, i know i'll have to add \ before special chars.)

I think you see the way i wanna make it work.
Sorry for my bad english ;)

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