Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

perl how to exit a while loop and quit reading the input file

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting perl how to exit a while loop and quit reading the input file
# 1  
Old 11-03-2009
perl how to exit a while loop and quit reading the input file
I am reading a file using While loop

Code:
while <FILE>
{
  $_ = <FILE>; 
  process data... 

}

I would like to quit reading the file once I encounter a String pattern. How do i do it.

is it
Code:
 if (/SUMMARY/)
 { 
  last; 
 }

I am having problems with uninitialized value in pattern matching and substitution and the while Loop does not end. Don't know how to get around that either..

thanks
Last edited by pludi; 11-03-2009 at 05:29 PM..
# 2  
Old 11-04-2009
Yep, how do you do this way ?

when in while (<FILE>) itself, you would get the line into $_, then why are you again reading into $_.

Remove that line. And if you have some other errors, come again with more clarity.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

ksh loop to read input until QUIT

Hi I'm looking to write a simple ksh loop reading user input (and write it to a file) until the user enters QUIT at which point I want it to continue. Does anyone have an example of this type of loop? Any help much appreciated Cheers (2 Replies)
Discussion started by: Grueben
2 Replies

2. Shell Programming and Scripting

Bash Question: HowTo Exit Script with User Input While Process is Running Mid-Loop?

Hi, I have written a script that allows me to repetitively play a music file $N times, which is specified through user input. However, if I want to exit the script before it has finished looping $N times, if I use CTRL+c, I have to CTRL+c however many times are left in order to complete the loop.... (9 Replies)
Discussion started by: hilltop_yodeler
9 Replies

3. Shell Programming and Scripting

Need to quit out of for loop.

Hi, Here is my code to send read.txt to three servers. col="prd167.mybank.com prd168.mybank.com bsprd169.mybank.com" set -A look $col for IndixList in ${look}; do scp /tmp/read.txt admin@$IndixList:/tmp done This works and all the 3 servers gets the read.txt file. However,... (8 Replies)
Discussion started by: mohtashims
8 Replies

4. Shell Programming and Scripting

Difference between exit, bye and quit in sftp

Hi All, I would like to know whether is there any difference in closing the sftp connection with exit, bye and quit. And would like to know the reliable command. (3 Replies)
Discussion started by: Girish19
3 Replies

5. Shell Programming and Scripting

Need help with perl script with a while loop reading file

Good morning, I appreciate any assistance that I can get from the monks out there. I am able to get this to work for me so that I can do a hostname lookup if I only specify one hostname in the script. What I want to do is have a file with hostnames and do lookups for each name in the file. Here is... (1 Reply)
Discussion started by: brianjb
1 Replies

6. UNIX for Advanced & Expert Users

how to quit or exit from WMToggle

I want directly to move from WMToggle to bash, which command to type? Now I need to type 3 times, :q! etc. any help? its very annoying to time something 3 times continuously :( (1 Reply)
Discussion started by: c_lady
1 Replies

7. Shell Programming and Scripting

Perl Script Not Reading Input Files Correctly

This is one of the strangest things that's happening to me. I'm writing a new Perl script that is trying to read a file. The file is originally in .mof format, but I also saved the contents into a .txt file. As a simple test, I wrote this: #!/user/bin/perl -w use strict; ... (3 Replies)
Discussion started by: kooshi
3 Replies

8. Shell Programming and Scripting

sed - write remaining input and quit?

I'm an infrequent user of sed. I searched this and other forums and read quite a bit of the O'Reilly book for an answer without luck. In my script I want sed to write the remainder of the input file and quit if it matches a pattern. e.g /Google/ Does anyone have an answer? thank. (5 Replies)
Discussion started by: lyledp
5 Replies

9. Shell Programming and Scripting

Perl - pass shell-vars into perl for input loop

I need to process a file line-by-line using some value from a shell variable Something like:perl -p -e 's/$shell_srch/$shell_replace/g' input.txt I can't make the '-s' work in the '-p' or '-n' input loop (or couldn't find a syntaxis.) I have searched and found... (4 Replies)
Discussion started by: alex_5161
4 Replies

10. Shell Programming and Scripting

Reading specific contents from 1 input files and appending it to another input file

Hi guys, I am new to AWK and unix scripting. Please see below my problem and let me know if anyone you can help. I have 2 input files (example given below) Input file 2 is a standard file (it will not change) and we have to get the name (second column after comma) from it and append it... (5 Replies)
Discussion started by: sksahu
5 Replies
Login or Register to Ask a Question