Re: how to send input to stdin automatically?

Many programs that read passwords do not read them from STDIN - they read keystrokes from the terminal. If CVS is one of those, then sending data to its STDIN will not help you.

But yes, you can run a program from Perl and pipe data to its STDIN...

open my $pipe, '|-', 'some-program arg1 arg2';
print {$pipe} "some data\n";
close $pipe;
[download]

If you also need to read from that program's STDOUT or STDERR, check out IPC::Open2, IPC::Open3 or System::Command.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

Comment on Re: how to send input to stdin automatically? Download Code

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Re^2: how to send input to stdin automatically? by salva (Canon) on Dec 18, 2012 at 09:06 UTC
`ssh` (as most programs asking for a password) does not read the password from stdin but from the process tty, so not opening a pipe neither using any of the modules you have named will work. The usual solution to automate password authentication is to use Expect.	[reply] [d/l]
Re^2: how to send input to stdin automatically? by skyworld_chen (Acolyte) on Dec 18, 2012 at 08:37 UTC
Hi tobyink, thanks for your kind reply. You are right, I do need to send password to keyboard, not STDIN. I have tried code you suggested, but the linux still asks for the password. My code is as this: `#!/usr/bin/perl open my $pipe,'\|-', 'cvs update'; print {$pipe} "my_password\n"; close $pipe;` [download] did I miss something? thanks.	[reply] [d/l]