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What is the slickest way to programatically read from stdin or an input file (if provided) in Perl?
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STDIN in Scalar ContextIn order to take input from the keyboard or operator is used in Perl. This operator reads a line entered through the keyboard along with the newline character corresponding to the ENTER we press after input.
To access your script's command-line arguments, you just need to read from @ARGV array. Perl allows using @ARGV array as filenames by using <>. The $ARGV contains the name of the current file when reading from <>.
Input to a Perl program can be given by keyboard with the use of <STDIN>. Here, STDIN stands for Standard Input .
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.
while (<>) { print; } will read either from a file specified on the command line or from stdin if no file is given
If you are required this loop construction in command line, then you may use -n option:
$ perl -ne 'print;' Here you just put code between {} from first example into '' in second
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