Question

What are the concepts that must be known by a new Perl developer for searching a job.
I mean to say that concept like CGI programming, OO concepts in Perl, use of different module from CPAN, etc.

Answer 1

Perl-related concepts are one category (including regexes, OO, cpan, etc etc); you presumably need to prove mastery of those — presumably by performing well on tasks of understanding, fixing and extending existing code (that’s how I would interview candidates, were I tasked with hiring perl programmers).

The second category is not really related to perl or any other specific language, but has to do with the general technologies needed in the specific job at hand. You mention CGI, and thats surely one possibility in SOME jobs — but HTTP and related concepts are broader and more widely applicable. E.g., one question I love to ask as an interviewer for ANY web related job is: explain at you favorite level of abstraction what happens when a user types in a browser www.foobar.com and hits enter. This lets me delve into as-deep-as-needed detail on HTTP, TCP, IP, DNS, caching of all kinds, etc, etc.

For a job with no web connection (if there were ANY left;-) I’d focus instead on whatever else the scripts the candidate will produce or maintain if hired are supposed to do — Linux kernel and sysadm issues, or maybe Windows or BSD or Solaris ones — or release engineering concepts, version control systems (distributed or otherwise), bioinformatics… whatever! KNOW what the job you’re interviewing for actually entails, and be prepared specifically for it: there’s NO “one size fits all”!-)