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operators - What does =~ do in Perl? - Stack Overflow
51 I guess the tag is a variable, and it is checking for 9eaf - but does this exist in Perl? What is the "=~" sign doing here and what are the "/" characters before and after 9eaf doing?

What is the meaning of @_ in Perl? - Stack Overflow
128 perldoc perlvar is the first place to check for any special-named Perl variable info. Quoting: @_: Within a subroutine the array @_ contains the parameters passed to that subroutine. More details can be found in perldoc perlsub (Perl subroutines) linked from the perlvar: Any arguments passed in show up in the array @_ .

What's the use of <> in Perl? - Stack Overflow
What's the use of <> in Perl. How to use it ? If we simply write <>; and while (<>) what is that the program doing in both cases?

operators - What is the difference between "||" and "or" in Perl ...
53 From Perl documentation: OR List operators On the right side of a list operator, it has very low precedence, such that it controls all comma-separated expressions found there.

Perl flags -pe, -pi, -p, -w, -d, -i, -t? - Stack Overflow
Below are the flags that I encounter most often, and I don't have a clue what they mean: perl -pe perl -pi perl -p perl -w perl -d perl -i perl -t I will be very grateful if you tell me what each of those mean and some use cases for them, or at least tell me a way of finding out their meaning.

How can I parse command-line arguments in a Perl program?
I'm working on a Perl script. How can I parse command line parameters given to it? Example: script.pl "string1" "string2"

operators - what is ||= in perl for? - Stack Overflow
In Perl, logical values are generally represented by 0 (or sometimes '' or undef) for false and 1 for true. However, to be more specific, any value that is not one of the above three false values is treated as true, and sometimes programmers refer to this distinction using the informal terms "truthy" and "falsy".

How do I perform a Perl substitution on a string while keeping the ...
In Perl, what is a good way to perform a replacement on a string using a regular expression and store the value in a different variable, without changing the original? I usually just copy the string to a new variable then bind it to the s/// regex that does the replacement on the new string, but I was wondering if there is a better way to do this?

Should I use \\d or [0-9] to match digits in a Perl regex?
Per perldoc perluniintro, Perl does not support using digits other than [0-9] as numbers, so I would definitely use [0-9] if the following are both true: You want to use the result as a number (such as performing mathematical operations on it or storing it somewhere that only accepts proper numbers (e.g. an INT column in a database)).

How do you round a floating point number in Perl?
Output of perldoc -q round Does Perl have a round () function? What about ceil () and floor ()? Trig functions? Remember that int() merely truncates toward 0. For rounding to a certain number of digits, sprintf() or printf() is usually the easiest route.