Automatically fill command line input of variable size

Question

I have a Python script which asks for some arguments when running (using raw_input). I'd like to be able to run this script and feed it with some inputs (basically, I need to alternate between 2 values as long as it needs input).

I know how to feed it with a single value using the yes program but I don't know how to obtain a sequence like a b a b a b

What's the simplest way ?

John Kugelman · Accepted Answer · 2013-08-22 15:52:31Z

6

yes $'a\nb' | script.py

Uses bash's $'...' syntax for string literals which contain escape sequences. Alternatively:

while true; do echo a; echo b; done | script.py

edited Aug 22, 2013 at 15:52

answered Aug 22, 2013 at 15:43

John Kugelman

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