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Comparing scalars in Perl
le - Less than or equal. Comparing values as strings.
How to provide STDIN to an external executable?
trim - removing leading and trailing white spaces with Perl
$$, $PROCESS_ID, $PID- The process number of the current script / program / executable.
Scope of Variables - video
Caching data using the Cache module
Skip tests if prerequisites are not installed
How to replace a string in a file with Perl
Writing to files with Perl
Set minimum version number in every Perl file
Three-argument form of open used and it is not available until perl 5.6.
IO::Socket::INET configuration failed
Construct the path to a file in the same directory as the current script
File::Spec - video
The 19 most important file-system tools in Perl 5
use Path::Tiny to read and write file
Attribute::Handlers to wrap a function
Appending to files
Command line counter with plain text file back-end