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Once upon a time, you opened files in Perl like so:
open(FH, ">$filename");
At some point, for many good reasons including some very sticky ones involving filenames with leading spaces, this syntax became available (and, immediately, preferred):
open(FH, '>', $filename);
What version of Perl did we get that syntax with?
526
Most often, open gets invoked with three arguments: the required FILEHANDLE (usually an empty scalar variable), followed by MODE (usually a literal describing the I/O mode the filehandle will use), and then the filename that the new filehandle will refer to.
If you want to open a file for reading and writing, you can put a plus sign before the > or < characters. open DATA, "+>file. txt" or die "Couldn't open file file.
Perl has a set of useful file test operators that can be used to see whether a file exists or not. Among them is -e, which checks to see if a file exists.
Looks like 5.6.0.
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