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? 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 @_ . Therefore, if you called a function ...
What is the difference between "||" and "or" in Perl? Asked 16 years, 9 months ago Modified 6 years, 5 months ago Viewed 114k times
operators - What is the difference between "||" and "or" in Perl ...
@pst, <> is not a file handle, "null" or otherwise. It's an operator. Specifically, the readline operator. There's a reference to it as the "angle operator" in perlvar, although there isn't actually any such operator. The angle brackets are used by two operators: readline or glob. The operator depends on the contents of the brackets.
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.
Perl flags -pe, -pi, -p, -w, -d, -i, -t? - Stack Overflow