Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

perl or awk remove empty lines when condition

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting perl or awk remove empty lines when condition
# 1  
Old 08-16-2010
perl or awk remove empty lines when condition
Hi Everyone,

Code:
[root@]# cat 1
a
b b
cc


1
2
3 3 3

4
55 5


a

b
[root@]# awk -vRS="" '{gsub("\n","")}1' 1
ab bcc
123 3 3
455 5
a
b

but the output should be:
Code:
ab bcc
123 3 3455 5
ab

means only when two empty lines only consider new record, otherwise if just has one empty lines in between, conbime lines.

Please advice.
Thanks
# 2  
Old 08-16-2010
Try this,

Code:
awk -vRS="\n\n\n+" '{gsub("\n","")}1' infile

This User Gave Thanks to pravin27 For This Post:
jimmy_y
# 3  
Old 08-16-2010
Quote:
Originally Posted by pravin27
Try this,

Code:
awk -vRS="\n\n\n+" '{gsub("\n","")}1' infile

SmilieSmilieSmilie
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Using sed, awk or perl to remove substring of all lines except the first

Greetings All, I would like to find all occurences of a pattern and delete a substring from the all matching lines EXCEPT the first. For example: 1234::group:user1,user2,user3,blah1,blah2,blah3 2222::othergroup:user9,user8 4444::othergroup2:user3,blah,blah,user1 1234::group3:user5,user1 ... (11 Replies)
Discussion started by: jacksolm
11 Replies

2. Shell Programming and Scripting

Remove CR only on empty lines

Dear community, I have two output files that contains some CR # cat first.out 1234567890 598679857648566 9 1234567234 365837465873465 4 2342343243 289374982374894 4 # cat second.out 2342342342 ... (2 Replies)
Discussion started by: Lord Spectre
2 Replies

3. Shell Programming and Scripting

remove duplicate lines with condition

hi to all Does anyone know if there's a way to remove duplicate lines which we consider the same only if they have the first and the second column the same? For example I have : us2333 bbb 5 us2333 bbb 3 us2333 bbb 2 and I want to get us2333 bbb 10 The thing is I cannot... (2 Replies)
Discussion started by: vlm
2 Replies

4. Shell Programming and Scripting

Perl XML, find matching condition and grep lines and put the lines somewhere else

Hi, my xml files looks something like this <Instance Name="New York"> <Description></Description> <Instance Name="A"> <Description></Description> <PropertyValue Key="false" Name="Building A" /> </Instance> <Instance Name="B"> ... (4 Replies)
Discussion started by: tententen
4 Replies

5. Shell Programming and Scripting

Command to remove duplicate lines with perl,sed,awk

Input: hello hello hello hello monkey donkey hello hello drink dance drink Output should be: hello hello monkey donkey drink dance (9 Replies)
Discussion started by: cola
9 Replies

6. Shell Programming and Scripting

What's the command to remove empty lines with sed?

3 10 20 10 100 100 10000 Output: 3 10 20 10 100 100 10000 ---------- Post updated at 07:59 AM ---------- Previous update was at 07:56 AM ---------- sed '/^$/d' file doesn't work. (8 Replies)
Discussion started by: cola
8 Replies

7. Shell Programming and Scripting

Remove lines from XML based on condition

Hi, I need to remove some lines from an XML file is the value within a tag is empty. Imagine this scenario, <acd><acdID>2</acdID><logon></logon></acd> <acd><acdID></acdID><logon></logon></acd> <acd><acdID></acdID><logon></logon></acd> <acd><acdID></acdID><logon></logon></acd> I... (3 Replies)
Discussion started by: giles.cardew
3 Replies

8. Shell Programming and Scripting

using vi -c to remove empty lines

Hello: I searched here for "vi -c" but found no hits. How can I use vi -c to remove ALL empty lines, regardless of how many? I tried <code> vi -c ":g/^$/d | wq" filename </code> but I have to run it several times. This is NOT homework. :) Thanks for your time. (3 Replies)
Discussion started by: Habitual
3 Replies

9. Shell Programming and Scripting

Using sed to remove lines where field is empty

I was just looking at this post: https://www.unix.com/shell-programming-scripting/22893-delete-multiple-empty-lines.html. and I am looking to achieve the same with sed. So the idea is to delete lines from a file where a certain field has no value. Inputfile: EMID MMDDYY HOURS JOB EMNAME 0241... (4 Replies)
Discussion started by: figaro
4 Replies

10. Shell Programming and Scripting

Awk scrip to remove empty field

Hi I have a file which looks like this name: Sally group: Group4 name: Tim group: Group1 name: Dan group: Group2 name: Chris group: Group3 name: Peter group: name: Fred group: name: Mary group: Group2 Well I want to get rid of the... (4 Replies)
Discussion started by: bombcan
4 Replies
Login or Register to Ask a Question