Visit Our UNIX and Linux User Community


How to limit the search to 'n' occurrences within a line


 
Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users How to limit the search to 'n' occurrences within a line
# 1  
Old 08-31-2009
Question How to limit the search to 'n' occurrences within a line

Hello All,

I am trying to search one pattern across a file and then print it. But i need to delimit the search per line to 2 occurrences. How do i do that?

Regards.
# 2  
Old 08-31-2009
Try...
Code:
 
awk -v var="searchstring" '{str=$0;cnt=gsub(var,arr);if(cnt==2)print str}' infile

# 3  
Old 08-31-2009
Code:
perl -nle '{print $_ if scalar(@_ = $_ =~ /pattern/g) == 2}' infile

# 4  
Old 09-03-2009
Question Not working for me :-(

Hello malcomex999, Vi-Curious,

Thanks for the replies.I tried both the suggestions but none of them worked for me :-(. My file contains -

~/Desktop$ cat b.txt
hello hello hello hello
good morning
good evening

I am trying to search for hello string in this file and am expecting it to print 'hello' only twice in the output. Please let me know if i am doing something wrong there.

~/Desktop$ awk -v var="hello" '{str=$0;cnt=gsub(var,arr);if(cnt==2)print str}' b.txt
<No OutPut here>

~/Desktop$ perl -nle '{print $_ if scalar(@_ == $_ =~ /hello/g) == 2}' b.txt
<No OutPut here>

Regards.



# 5  
Old 09-03-2009
A slight modification in the Vi-Curious does the trick.

Code:
perl -nle '{print "$_[0] $_[1]" if (@_ = $_ =~ /hello/g) }' b.txt

# 6  
Old 09-03-2009
Or awk...

Code:
 
awk -v var="hello" '{cnt=gsub(var,arr);if(cnt>=2)print var,var}' infile

# 7  
Old 09-03-2009
Quote:
Originally Posted by Linuxee
Hello malcomex999, Vi-Curious,

~/Desktop$ perl -nle '{print $_ if scalar(@_ == $_ =~ /hello/g) == 2}' b.txt
<No OutPut here>
The reason there was no output was because the first occurrence of == in your example should have been just a single =. Others have already posted follow-up examples to your latest query so I'll just say that this would have printed the entire line if it contained exactly 2 occurrences of the search pattern. It wasn't clear from your initial post that you wanted to print out the first 2 occurrences of (only) the search pattern if it occurred 2 or more times in the line.

Previous Thread | Next Thread
Test Your Knowledge in Computers #137
Difficulty: Easy
Unix systems are characterized by a modular design that is sometimes referred to as the 'Unix philosophy'.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Delete multiple occurrences of the same pattern on a line but the first

The lines that I am trying to format look like Device ID: j01-01, IP address: 10.10.10.36, IP address: 10.10.10.35, IP address: 10.10.102.201, Platform: 8040, Capabilities: Host , Interface: GigabitEthernet9/45, Port ID (outgoing port): e0k,Here is what I have so far but it... (4 Replies)
Discussion started by: dis0wned
4 Replies

2. UNIX for Advanced & Expert Users

sed REGEX to print multiple occurrences of a pattern from a line

I have a line that I need to parse through and extract a pattern that occurs multiple times in it. Example line: getInfoCall: info received please proceed, getInfoCall: info received please proceed, getInfoCall: info received please proceed, getInfoCall: info received please proceed,... (4 Replies)
Discussion started by: Vidhyaprakash
4 Replies

3. Shell Programming and Scripting

How to search number of occurrences of a particular string in a file through vi editor?

i have one file, i am doing 'vi Filename' now i want to search for particular string and i want to know how many times that string occurs in whole file (5 Replies)
Discussion started by: sheelsadan
5 Replies

4. Programming

Limit line for perl

Hey guys, can help me out with this? How do i limit output for xml to 50 character? i tried *below* but doesnt work, it still print more than 50 characters. Thanks in advance printf "%-50s", "$testline\n"; (4 Replies)
Discussion started by: Nick1097
4 Replies

5. Shell Programming and Scripting

grep by limit search

Hi I am in new in unix,can any one tell how to grep the data by limit. suppose I have below data:- is :mSecs is :mSecs is :mSecs is :mSecs requirement is how to grep the data which is having count greater than 1000 msecs only. thanks in adnavce. (2 Replies)
Discussion started by: abhigrkist
2 Replies

6. Shell Programming and Scripting

sed: how to limit pattern search to first instance only

I need to reduce a file's size below 50MB by deleting chucks of text. The following sed does this. sed '/^begpattern/,/endpattern/d' myfile However, it's possible that the file size can get below 50MB by just deleting the first instance of the pattern. How do I code that into sed? Or can awk... (8 Replies)
Discussion started by: mariod1049
8 Replies

7. Shell Programming and Scripting

perl search and replace - search in first line and replance in 2nd line

Dear All, i want to search particular string and want to replance next line value. following is the test file. search string is tmp,??? ,10:1 "???" may contain any 3 character it should remain the same and next line replace with ,10:50 tmp,123 --- if match tmp,??? then... (3 Replies)
Discussion started by: arvindng
3 Replies

8. Shell Programming and Scripting

sed replace multiple occurrences on the same line, but not all

Hi there! I am really enjoying working with sed. I am trying to come up with a sed command to replace some occurrences (not all) in the same line, for instance: I have a command which the output will be: 200.300.400.5 0A 0B 0C 01 02 03 being that the last 6 strings are actually one... (7 Replies)
Discussion started by: ppucci
7 Replies

9. UNIX for Dummies Questions & Answers

Search and Count Occurrences of Pattern in a File

I need to search and count the occurrences of a pattern in a file. The catch here is it's a pattern and not a word ( not necessarily delimited by spaces). For eg. if ABCD is the pattern I need to search and count, it can come in all flavors like (ABCD, ABCD), XYZ.ABCD=100, XYZ.ABCD>=500,... (6 Replies)
Discussion started by: tektips
6 Replies

10. Shell Programming and Scripting

grep line length limit

Hi Friends, I am having a funny problem with grep. When I run grep 'expr' file.txt things work fine. But when try to get the line number using the -n option, i.e, grep -n 'expr' file.txt I get a message, "grep: 0652-226 Maximum line length of 2048 exceeded." If the line has more than... (3 Replies)
Discussion started by: hnhegde
3 Replies

Featured Tech Videos