Checking for a non-exisiting variable?

[Kenny100]

Hi Folks

I've got a little Perl program that reads in variables from an external file (config.txt). It uses a simple while loop to extract the contents of config.txt and split the name/values on the = sign.

I'd like to put in some error checking into my program that makes sure that all variables have been included in config.txt. At the moment, if I remove a variable from config.txt I get errors.

Therefore, how can I check that a variable actually EXISTS? Basically I need somethine like:

1. Read in file contents (DONE)
2. Split contents on = sign into name/values (DONE)
3. Check if e.g. $fname exists. If not, set it to a default value and continue.

Can this be done?

Cheers,
Kenny.

 

[rosenk]

[tt]$fname = "default.txt" if !defined $fname;[/tt]

 

[Kenny100]

Thanks rosenk!