ssh command not running perl script

Question

I have following perl script

#!/usr/bin/perl
$userinput =  <STDIN>;
chomp ($userinput);
while ( $userinput ne "DONE")
{
        print STDOUT "User typed ----->  $userinput\n";
        $userinput =  <STDIN>;
        chomp ($userinput);
}

I have copied this on on unix box, locally this works fine but when I try to run this perl script remotely from another box using ssh, it does not work.

I am running this script using following command.

ssh username@hostname /tmp/testremote.pl

It just hangs on the STDIN and does not return anything.

Any idea why this is not working?

Just to be clear: /tmp/testremote.pl must exist on the remote machine -- does it? — j_random_hacker
– j_random_hacker, Commented Dec 29, 2010 at 6:36

ysth · Accepted Answer · 2010-12-29 06:39:15Z

5

Try adding $|=1; after the #! line.

edited Dec 29, 2010 at 6:39

answered Dec 29, 2010 at 6:33

ysth

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Comments

Nathan Fellman · Accepted Answer · 2010-12-30 04:21:12Z

2

your terminal's STDIN is probably not being redirected correctly to the remote terminal.

You can try:

ssh username@hostname 'echo bla bla bla | /tmp/testremote.pl'

And if this works it will indicate that the perl script is fine, but the problem is your redirection.

edited Dec 30, 2010 at 4:21

answered Dec 29, 2010 at 6:43

Nathan Fellman

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1 Comment

j_random_hacker Over a year ago

Would be a good test if not for the single quote after the last "bla".

Raskolnikoff Suzuki · Accepted Answer · 2010-12-29 06:25:40Z

0

ssh username@hostname '/tmp/testremote.pl'

Please try to add single quote to your command.

answered Dec 29, 2010 at 6:25

Raskolnikoff Suzuki

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1 Comment

Nathan Fellman Over a year ago

That will only help if the command being sent to ssh requires shell interpolation.

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