2011年4月5日 · Here the sigil changes to $ to denote that you are accessing a scalar, however the trailing [0] tells perl that it is accessing a scalar element of the array in _ or in other words, @_. – Eric Strom

man perlop "perlop - Perl operators and precedence" (at least in UNIX-like) answers this question: "Binary "=~" binds a scalar expression to a pattern match." – U. Windl Commented Apr 1, 2020 at 21:11

2016年2月2日 · The => operator in perl is basically the same as comma. The only difference is that if there's an unquoted word on the left, it's treated like a quoted word. The only difference is that if there's an unquoted word on the left, it's treated like a quoted word.

Perl arrow operator has one other use: Class−>method invokes subroutine method in package Class. though it's completely different than your code sample. Only including it for completeness for the question in the title.

2010年12月30日 · 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 @_.

2015年3月13日 · So, if the shell is handing you a bunch of file names, and you'd like to go through each one's data in turn, perl's <> operator gives you a nice way of doing that...it puts the next line of the next file (or stdin if no files are named) into $_ (the default scalar). Here is a poor man's grep: while(<>) { print if m/pattern/; } Running this script:

2015年1月25日 · You can inspect the code actually used by Perl with the core module B::Deparse. This compiler backend module is activated with the option -MO=Deparse.

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 takes the -ie to mean that you want to replace in place, and to add e to the end of each backup file's name. You have to do perl -pi -e or perl -p -i -e . – Andy Lester

2012年5月2日 · =~ is the Perl binding operator. It's generally used to apply a regular expression to a string; for instance, to test if a string matches a pattern: It's generally used to apply a regular expression to a string; for instance, to test if a string matches a pattern: