?
Solved

usage of 'perl -le' in for loop

Posted on 2004-04-07
6
Medium Priority
?
764 Views
Last Modified: 2013-12-26
I wanted to know what is "perl -le" in the below for loop :

for i in `perl -le 'for(1..10) {print}'`
do
echo $i
done

It would be good if a detailed explanation is given.
0
Comment
Question by:spandana_b
4 Comments
 
LVL 7

Accepted Solution

by:
leflon earned 100 total points
ID: 10774227
Hi spandana_b,

perl -le 'for(1..10){print}'

calls the perl interpreter and executes the perl command supplied in the '...'.
this command will print the numbers from 1 to 10 in the following way

1
2
3
4
5
6
7
8
9
10

-l will have each number printed in seperate line
-e tells perl that a perl script follows in the '...' part

hth
leflon
0
 

Author Comment

by:spandana_b
ID: 10777182
Thanks for that.
I want to know on more thing can any command be given in place of print?

rgds.
0
 
LVL 48

Assisted Solution

by:Tintin
Tintin earned 100 total points
ID: 10779277
You can use any valid Perl syntax instead of the print.  What are you trying to do?
0
 

Expert Comment

by:rmundkowsky
ID: 10795008
You can call other unix commands in perl like so:

perl -le '$blah=`echo "why use Perl"`;print $blah'
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, I'll describe -- and show pictures of -- some of the significant additions that have been made available to programmers in the MFC Feature Pack for Visual C++ 2008.  These same feature are in the MFC libraries that come with Visual …
Introduction: Dialogs (2) modeless dialog and a worker thread.  Handling data shared between threads.  Recursive functions. Continuing from the tenth article about sudoku.   Last article we worked with a modal dialog to help maintain informat…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an anti-spam), the admin…
Suggested Courses

862 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question