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@_ is the parameters passed to the subroutine, so it's putting the passed-in parameters into the local $class and $hashref variables.

$hashref is presumably a reference to a hash, so you can look...

Nested scripts are read from the inside, out. Find the innermost script/command/calculation that doesn't depend on the results of another command/function. Once you have that value, work your way...

It's easier with the unix tr command.

cat oldfile | tr -d '"' > newfile

In vi:

<ESC> :%s/"//g

Another FYI for completeness for future searchers. The percent sign means to look on all lines of the file. if you only wanted to apply the search/replace on a range of lines, you can replace the...

in vi editor mode

:%s/'//g
:%s/-//g