Good Example on $|

12-30-2013

Registered User

103, 2

Join Date: Mar 2008

Last Activity: 15 October 2019, 10:16 PM EDT

Posts: 103

Thanks Given: 25

Thanked 2 Times in 2 Posts

Good Example on $|

I am trying to learn how to use the predefined var. I did read perlvar - perldoc.perl.org but like much of the perl docs, I just dont "see" the explanation.

Can someone explain its usage to me. Id like to buffer printing on occasion.

Thanks in advance.

popeye

View Public Profile for popeye

Find all posts by popeye

12-30-2013

Moderator

12,296, 3,792

Join Date: Nov 2008

Last Activity: 1 January 2021, 1:47 AM EST

Location: Amsterdam

Posts: 12,296

Thanks Given: 679

Thanked 3,792 Times in 3,282 Posts

Quick example, don't mind the correctness of the code, just meant as an illustration (using bash):

Code:

while :; do echo $((i++)); sleep 1;done | perl -ne 'print' | while read x ; do echo $x ; done

vs.:

Code:

while :; do echo $((i++)); sleep 1;done | perl -ne '$|=1; print' | while read x ; do echo $x ; done

Scrutinizer

View Public Profile for Scrutinizer

Find all posts by Scrutinizer

Shell Programming and Scripting

Good Example on $|

3 More Discussions You Might Find Interesting

1. What is on Your Mind?

What is good?

Discussion started by: gitac

2. IP Networking

What is a good C++ compiler?

Discussion started by: walidfinder

3. Solaris

good OS flavor

Discussion started by: mxlst14