How many ways are there of getting stdin input in perl?

I have been learning perl, and find the motto interesting. It says there are multiple ways of doing anything. I know that you can use print and say to output stuff, but I haven't found any other way to read input than to use a predefined file pointer-like thing.

Are there any other ways?

Solution

This question is too broad.

There are many different ways to read from a handle:

<>/readline (with $/ = $line_ending;)
<>/readline (with $/ = undef;)
<>/readline (with $/ = \$block_size;)
<>/readline (with $/ = "";)
getc
read
sysread
...

Then there are tools to work with terminals.

Term::ReadKey
Term::ReadLine
Curses
...

Also, handles can be represented in multiple ways.

A reference to an IO value (e.g. *STDIN{IO})
A glob containing an IO value (e.g. *STDIN)
A ref to a glob containing an IO value (e.g. \*STDIN)
The name of a glob containing an IO value (e.g. 'STDIN')
An IO::Handle object

In one-liners, -n, -p, -l, -0, -F, -a and -C all have some connection to STDIN.

...