Display output of the command over SSH on run time

Question

I am running a perl script over ssh like the below:

[dipuh@local ~]$ ssh dipuh@myremote_001 'perl /home/dipuh/a.pl'

The content of a.pl is the below:

print "Sleeping \n";
sleep(60);
print "Waking Up";

Here my local terminal waits for the perl script to execute completely and once finished displays the complete output. The initial "Sleeping" text also will be printed only with the final output.

Is there any way, in my local terminal, I can display the output of each command in the perl script at the run time, instead of waiting for the whole perl script to finish.

Chankey Pathak · Accepted Answer · 2016-09-23 09:42:52Z

4

You are suffering from buffering.

You may either set $| to 1 for the block.

{
    local $| = 1;
    print "Sleeping \n";
    sleep(60);
    print "Waking Up";
}

Or use IO::Handle

use IO::Handle;
STDOUT->autoflush(1);

answered Sep 23, 2016 at 9:42

Chankey Pathak

21.8k12 gold badges88 silver badges138 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

redneb · Accepted Answer · 2016-09-23 09:38:45Z

2

You can try to turn the autoflush mode on. The old fashioned way to it is by adding the following at the top of your script:

$| = 1;

or you can do it with the more modern way:

use IO::Handle;

STDOUT->autoflush(1);

Alternatively, you can flush the STDOUT on demand with:

use IO::Handle;

print "Sleeping \n";
STDOUT->flush;
sleep(60);
print "Waking Up";
STDOUT->flush;

answered Sep 23, 2016 at 9:38

redneb

24.4k6 gold badges50 silver badges57 bronze badges

Collectives™ on Stack Overflow

Display output of the command over SSH on run time

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related