I need to use perl script to capture output from two programs when inputing some thing to them.

the first program called sac is used in shell like this: 

$sac
SAC> I input some thing and enter
SAC> output some content that I need to capture
SAC> I type 'quit' and enter
$

[download]

the second program called gmt is used in shell like this: 

$gmt parameters
I input some thing and enter
I input some thing and enter
Ctrl+D
output some content that I need to capture
$

[download]
Thank you!

In reply to How to use perl to capture its output while inputting data to an external command by wangliang

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