Comparing scalars in Perl
le - Less than or equal. Comparing values as strings.
$a - $b - Special variables when using sort(). Don't use them for anything else besides your sort function!
Don't use $a and $b outside of sort, not even for examples
Three-argument form of open used and it is not available until perl 5.6.
Reading Excel file using Perl - video
Dancer Simple Session and testing a session
Basic Authentication without a Challenge
How to extract strings from a file
How to eliminate a value in the middle of an array in Perl?
How to remove, copy or rename a file with Perl
delete an element from a hash
exists, delete in hash - video
Check test coverage - add compile tests
Open and read from text files
tell how far have we read a file
Speed up calculation by running in parallel
Constants and read-only variables in Perl
Finding all Plack Middleware or Perl::Critic Policies