How to use perl to capture its output while inputting data to an external command

wangliang has asked for the wisdom of the Perl Monks concerning the following question:

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!

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Re: How to use perl to capture its output while inputting data to an external command by Fletch (Bishop) on Sep 24, 2021 at 03:54 UTC
Something like IPC::Run will (presuming the presence of an *NIX-y enough OS with ptys) make `expect`-ish automation of interactive programs possible. Alternately there's . . . erm, Expect. Use one of those to start your program, send it your input, read back the output, yadda yadda yadda. The cake is a lie. The cake is a lie. The cake is a lie.	[reply] [d/l]
Re: How to use perl to capture its output while inputting data to an external command by hippo (Archbishop) on Sep 24, 2021 at 08:24 UTC
See the relevant FAQs: How can I open a pipe both to and from a command? How can I write expect in Perl? ... and perhaps some others from perlfaq8 🦛	[reply]
Re: How to use perl to capture its output while inputting data to an external command by karlgoethebier (Abbot) on Sep 24, 2021 at 18:41 UTC
BTW and just for curiosity and for my mental health: Is this a homework some weird professor imagined? No kidding. And best regards, Karl ŤThe Crux of the Biscuit is the Apostropheť	[reply]