Re: detect input available from command line

[jwkrahn]

if ( @ARGV ) {
    while (<>) {
    }
}
else {
    # do something else
}

[mifflin]

What if the input is not coming from @ARGV but from stdin?
example:

$ ./testprog -t [e-mail] -s test5 <<EOT;
> stuff
> typed
> in 
> here
> EOT

In this case @ARGV is empty but there is still something to read. How would I detect this?

[Eliya]

You could test

if (@ARGV or !-t STDIN and !eof()) {
    while (<>) {
        ...

(but any non-input file arguments would need to be removed from @ARGV first, of course)

This should work with input file arguments on the command line, heredoc input (<<), input redirect (<), and piping into the program (|).

Update: actually, I think you don't even need the eof().

[jwkrahn]

I have a program that may try to get data from the command line using

What if the input is not coming from @ARGV but from stdin?

If the input is coming from STDIN then it is not on the command line.