How to check ARGF is empty or not in Ruby -

i want argf this.

# file.rb if argf.???   puts argf.read else   puts "no redirect." end  $ echo "hello world" | ruby file.rb hello world  $ ruby file.rb no redirect.

i need without waiting user input. tried eof? or closed? doesn't help. ideas?

note misunderstood argf. please see comments below.

basically you'd examine #filename. 1 way is:

if argf.filename != "-"   puts argf.read else   puts "no redirect." end

and more complete form:

#!/usr/bin/env ruby if argf.filename != "-" or (not stdin.tty? , not stdin.closed?)   puts argf.read else   puts "no redirect." end

another:

#!/usr/bin/env ruby if not stdin.tty? , not stdin.closed?   puts stdin.read else   puts "no redirect." end

O9