Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

First occurance

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting First occurance
# 1  
Old 12-01-2009
First occurance
A PERL script that prints just the first occurrence of a string in a file and immediately exits (the string and the filename are the first and the second command line arguments; I used filehandle to open an input file).
# 2  
Old 01-04-2010
Code:
open my $fh , '<' , $ARGV[1] || die "$!";
my $occ = 1;
while (<$fh>){
        chomp ;
        if (/$ARGV[0]/){
                print "matches at line $occ\n";
                last;
        }
        $occ++;
}
close $fh;

HTH,
PL
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Extract only first occurance

Hi All, From the below file. I need to get only the first occurrence and print. I tried to do it in separate grep not coming as expected Original file 11001;1213;304;;;;;;;111020677.64;;;;;;;;;;;;;;;;;;;;;;;;;; 11001;1214;304;;;;;;;102376462.96;;;;;;;;;;;;;;;;;;;;;;;;;;... (5 Replies)
Discussion started by: arunkumar_mca
5 Replies

2. Shell Programming and Scripting

Multiple occurance of file

Hi all, I have file structure as file.log 84t-rw-r--r-- 1 emily04 us_cms 24492717 Oct 5 13:29 vgtree_84_1_K3L.root 85t-rw-r--r-- 1 emily04 us_cms 50410380 Oct 5 16:06 vgtree_85_1_uZv.root 85t-rw-r--r-- 1 emily04 us_cms 50567380 Oct 5 16:06 vgtree_85_1_hjv.root 86t-rw-r--r-- 1 emily04... (4 Replies)
Discussion started by: emily
4 Replies

3. Shell Programming and Scripting

Search and replace only the first occurance

Hi, I need to search a string and replace with nothing, but only the First occurring string using sed/perl/awk (3 Replies)
Discussion started by: suraj.sheikh
3 Replies

4. Shell Programming and Scripting

Trying to grep for '--' occurance

Hello Im trying to grep for a string in grub.conf . I've used the -F option since its a long string, but when i execute, i run into errors. Script and output below. GRUBPASSWD="password --md5 xyz" if grep -Fxq $GRUBPASSWD /etc/grub.conf then . . output: grep: unrecognized option... (5 Replies)
Discussion started by: bludhemn
5 Replies

5. Shell Programming and Scripting

Need 10 lines before the first occurance of a pattern

Here is the text file: 1This is a text file 2this is a text file 3This is a text file 4this is a text file 5This is a text file 6this is a text file 7This is a text file 8this is a text file 9This is a text file 10this is a text file 11This is a text file 12this is a text file 13This... (4 Replies)
Discussion started by: Johny001
4 Replies

6. UNIX for Dummies Questions & Answers

Replace first 5 occurance of a pattern

There is scenario that i have to replace a pattern at the first 5 occurance in a file. say i need to replace 'abc' by 'xyz' at its first 5 occurance in a file a.txt, can anybody help me how it can be done, i can do complete replacement of the pattern using sed throughtout the file. (1 Reply)
Discussion started by: palash2k
1 Replies

7. Shell Programming and Scripting

Split on last occurance

I want to call a script like this: ./somescript some-thing.knows.what.ending Inside the script it needs to split at last .(period) so I can: a=some-thing.knows.what b=ending I know I can do it in perl but im still learing awk and sed. Thanks (3 Replies)
Discussion started by: Ikon
3 Replies

8. Shell Programming and Scripting

How to insert values in 1st occurance out of two occurance in a file

Hi I have a file which contains the following two lines which are same But I would like to insert the value=8.8.8.8 in the 1st occurance line and value=9.9.9.9 in the 2nd occurance line. <parameter name="TestIp1" value=""> <parameter name="TestIp1" value=""> Please suggest (1 Reply)
Discussion started by: madhusmita
1 Replies

9. UNIX for Dummies Questions & Answers

replace the n'th occurance in a file

Hi All, How can i replace the n'th occurance in a file. ? I have a property file like EAR;_TrackingEAR;META-INF/application.xml;xml;context-root;1;valeur EAR;_TrackingEAR;META-INF/application.xml;xml;context-root;2;valeur2... (2 Replies)
Discussion started by: subin_bala
2 Replies

10. Shell Programming and Scripting

awk: last occurance

Hi All, I need to extract the last occurance of a pattern match. So far I've got the code below which extracts the first occurance. Any ideas how I can modify it so that it extracts the last? BEGIN {} { if (data++ == 0) ... (17 Replies)
Discussion started by: pondlife
17 Replies
Login or Register to Ask a Question