Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

read and match multiple lines in perl

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting read and match multiple lines in perl
# 1  
Old 03-13-2008
read and match multiple lines in perl
Could any one tell me how to read and match multiple lines in perl? Did this code below still work in this situation?

while (<FILE>) {
if (/ /) {
}
}

Thanks a lot!
# 2  
Old 03-13-2008
You may need to clarify your question.
  • Reading lines in a loop and match line by line (as you demonstrated): yes
  • Reading a string consisting of multiple lines and match that string (across line breaks): yes

For second case, look at the //s modifier.
perlre - perldoc.perl.org
# 3  
Old 03-13-2008
Sorry, I should make my question more clear. So here is an example.

AAA
BBBBBBBBBB
CCCCCCCCCC
DDDDDDDDD
EEEEEEEEEEE

The file contains five lines, one way to process this by using while (<>) and if which read the line one by one. Is there a way I can read all the five lines into a single string and process them all at once.

Thanks a lot!
# 4  
Old 03-14-2008
Use for/foreach instead of while.
# 5  
Old 03-14-2008
Quote:
Is there a way I can read all the five lines into a single string and process them all at once.
Yes:

Code:
open (IN, 'yourfile') or die "$!";
my $string = do {local $/; <IN>};
close IN;
print $string;

process $string however you need to.
# 6  
Old 03-14-2008
Quote:
Originally Posted by rikxik
Use for/foreach instead of while.
Could you give more details? Thanks!
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Removing multiple lines from input file, if multiple lines match a pattern.

GM, I have an issue at work, which requires a simple solution. But, after multiple attempts, I have not been able to hit on the code needed. I am assuming that sed, awk or even perl could do what I need. I have an application that adds extra blank page feeds, for multiple reports, when... (7 Replies)
Discussion started by: jxfish2
7 Replies

2. Shell Programming and Scripting

Remove multiple lines that match pattern

Not sure how I can accomplish this. I would like to remove all interfaces that have the commands I would like to see: switchport port-security, spanning-tree portfast. One line is no problem. interface FastEthernet0/8 spanning-tree portfast interface FastEthernet0/9 spanning-tree... (4 Replies)
Discussion started by: mrlayance
4 Replies

3. Shell Programming and Scripting

Grep multiple exact match, do not display lines

Hi, Need help to grep the following from a file x. I just want to grep exact match not lines and not partial word. CONFSUCCESS CONFFAIL CONFPARTIALSUCCESS >cat x xczxczxczc zczczcxx CONFSUCCESS czczczcczc czxxczxzxczcczc CONFFAIL xczxczcxcczczc zczczczcz CONFPARTIALSUCCESS czczxcxzc ... (4 Replies)
Discussion started by: rajeshwebspere
4 Replies

4. Shell Programming and Scripting

Regular expression to match multiple lines?

Using a regular expression, I would like multiple lines to be matched. By default, a period (.) matches any character except newline. However, (?s) and /s modifiers are supposed to force . to accept a newline and to match any character including a newline. However, the following two perl... (4 Replies)
Discussion started by: LessNux
4 Replies

5. Shell Programming and Scripting

Simple awk match for multiple lines

Is there a simple way to use awk to match multiple lines?? Somehow using \n isn't working for me. Ultimately I'm trying to insert "WWW" 3 lines above "eee". input aaa bbb ccc ddd eee fff output aaa bbb WWW ccc ddd eee (1 Reply)
Discussion started by: pxalpine
1 Replies

6. Shell Programming and Scripting

sed read X lines after match

I want to do something like sed -n '/PATTERN/,+10p' and get the ten lines following PATTERN. However, this throws an "expected context address" with the sed that comes with OSX Lion. If that + is a GNUism, can I do this, or do I have to find another tool? (2 Replies)
Discussion started by: jnojr
2 Replies

7. Shell Programming and Scripting

Awk match multiple columns in multiple lines in single file

Hi, Input 7488 7389 chr1.fa chr1.fa 3546 9887 chr5.fa chr9.fa 7387 7898 chrX.fa chr3.fa 7488 7389 chr21.fa chr3.fa 7488 7389 chr1.fa chr1.fa 3546 9887 chr9.fa chr5.fa 7898 7387 chrX.fa chr3.fa Desired Output 7488 7389 chr1.fa chr1.fa 2 3546 9887 chr5.fa chr9.fa 2... (2 Replies)
Discussion started by: jacobs.smith
2 Replies

8. Shell Programming and Scripting

print lines which match multiple patterns

Hi, I have a text file as follows: 11:38:11.054 run1_rdseq avg_2-5 999988.0000 1024.0000 11:50:52.053 run3_rdrand 999988.0000 1135.0 128.0417 11:53:18.050 run4_wrrand avg_2-5 999988.0000 8180.5833 11:55:42.051 run4_wrrand avg_2-5 999988.0000 213.8333 11:55:06.053... (2 Replies)
Discussion started by: annazpereira
2 Replies

9. Shell Programming and Scripting

Perl: Printing Multiple Lines after pattern match

Hello People, Need some assistance/guidance. OUTLINE: Two files (File1 and File2) File1 has some ids such as 009463_3922_1827 897654_8764_5432 File2 has things along the lines of: Query= 009463_3922_1827 length=252 (252 letters) More stufff here ... (5 Replies)
Discussion started by: Deep9000
5 Replies

10. Shell Programming and Scripting

Concatenating multiple lines to one line if match pattern

Hi all, I've been working on a script which I have hit a road block now. I have written a script using sed to extract the below data and pumped into another file: Severity............: MAJORWARNING Summary: System temperature is out of normal range. Severity............: MAJORWARNING... (13 Replies)
Discussion started by: phixsius
13 Replies
Login or Register to Ask a Question