/dev/tty stdin

Xris718 · 07-12-2012, 10:57 AM

Hi

I have a tripwire program that I need to automate during its system check and accept the changes made on the system. The problem is that its an interactive process and its asking twice for a passphrase to be entered. Based on the man pages it looks like its trying to accept the passphrase from /dev/tty stdin. I wanted to find out if there is a way to redirect the passphrase ran by a shell script to /dev/tty so the process running tripwire can accept the stdin from a script and finish its run.

MensaWater · 07-12-2012, 12:51 PM

This is the kind of thing "expect" is designed to do. Script interactive sessions.

If you do a web search for "using expect" you'll see many examples.

Xris718 · 07-12-2012, 01:12 PM

You are correct expect can do it. However I need to do it in shell and wanted to find out if there was some kind of a way.

MensaWater · 07-12-2012, 01:34 PM

You can call expect from shell scripts.

You can try to figure it out shell without expect using Here Document format as described at:
http://en.wikipedia.org/wiki/Here_document

However, the reason I suggested expect was because you said it asks for input twice. That makes it a perfect candidate for expect which allows for multiple ask/response setups.

Xris718 · 07-12-2012, 02:29 PM

I know that expect can do it. However I need to do it in shell. This way I have only one syntax code to maintain.

MensaWater · 07-12-2012, 02:45 PM

Quote:

Originally Posted by Xris718

I know that expect can do it. However I need to do it in shell. This way I have only one syntax code to maintain.

Did you read the rest of my post?

Xris718 · 07-13-2012, 09:50 AM

Hi yes I did take a look at the rest of your post and tried it out using the here document approach, however the results were not successful. Tripwire makes its run but fails to accept input twice in automated fashion.