Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Remove lines from batch of files which match pattern

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Remove lines from batch of files which match pattern
# 1  
Old 12-02-2009
Remove lines from batch of files which match pattern
I need to remove all lines which does not match the pattern from a text file (batch of text files). I also need to keep the header line which is the first line of the file. Please can you provide an example for that.

I used this to solve half of my work. I was unable to keep the first line of the file with this. Please help. Thanks.

sed -i '/searchtext/!d' *.txt
# 2  
Old 12-02-2009
Code:
Try this, 

$sed -i '1!{/searchtext/!d}'  *.txt

# 3  
Old 12-02-2009
Code:
awk 'NR==1||!/searchtext/' urfile

# 4  
Old 12-02-2009
MySQL
Thanks very much for the help. It worked.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

awk to remove pattern and lines above pattern

In the awk below I am trying to remove all lines above and including the pattern Test or Test2. Each block is seperated by a newline and Test2 also appears in the lines to keep but it will always have additional text after it. The Test to remove will not. The awk executed until the || was added... (2 Replies)
Discussion started by: cmccabe
2 Replies

2. Shell Programming and Scripting

Awk; pattern match, remove and re write

the following pattern match works correctly for me awk '/name="Fruits"/{f=1;next} /"name=Vegetables"/{f=0} f' filename This works well for me. Id like to temporarily move the match out of the file ( > newfile) and be able to stick it back in the same place at a later time. Is this... (7 Replies)
Discussion started by: TY718
7 Replies

3. 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

4. Shell Programming and Scripting

Match Pattern and print pattern and multiple lines into one line

Hello Experts , require help . See below output: File inputs ------------------------------------------ Server Host = mike id rl images allocated last updated density vimages expiration last read <------- STATUS ------->... (4 Replies)
Discussion started by: tigerhills
4 Replies

5. Shell Programming and Scripting

Awk-sed help : to remove first and last line with pattern match:

awk , sed Experts, I want to remove first and last line after pattern match "vg" : I am trying : # sed '1d;$d' works fine , but where the last line is not having vg entry it is deleting one line of data. - So it should check for the pattern vg if present , then it should delete the line ,... (5 Replies)
Discussion started by: rveri
5 Replies

6. Shell Programming and Scripting

counting lines that match pattern

I have a file of 1.3 millions lines. some are with the same word twice on the line, some line have two diffrent words. each line has two words, one in brackets. example: foo (foo) bar (bar) thae (awvd) beladf (vswvw) I am sure this can be done with one line of... (6 Replies)
Discussion started by: robsonde
6 Replies

7. UNIX for Dummies Questions & Answers

Join the lines until next pattern match

Hi, I have a data file where data is splitted into multiple lines. And, each valid record starts with a patten date | <?xml and ends with pattern </dmm> e.g. 20120924|<?xml record 1 line1....record 1 line1....record 1 line1.... record 1 line2....record 1 line2....record 1 line2.... record 1... (3 Replies)
Discussion started by: Dipalik
3 Replies

8. Shell Programming and Scripting

Need one liner to search pattern and print everything expect 6 lines from where pattern match made

i need to search for a pattern from a big file and print everything expect the next 6 lines from where the pattern match was made. (8 Replies)
Discussion started by: chidori
8 Replies

9. Shell Programming and Scripting

Batch rename files that do not match pattern

Hi all, I do not have programming experience and mostly use one-liner or sometimes more to get the job done. I am having problem to batch rename the files that do not match a particular pattern. Sample file-names from directory: Meeting_Packages.pdf 13_textfile0 19_textfile0 ... (3 Replies)
Discussion started by: atulkakrana
3 Replies

10. UNIX for Dummies Questions & Answers

How to delete lines do NOT match a pattern

On Unix, it is easy to get those lines that match a pattern, by grep pattern file or those lines that do not, by grep -v pattern file but I am editing a file on Windows with Ultraedit. Ultraedit support regular expression based search and replace. I can delete all the lines that match a... (1 Reply)
Discussion started by: JumboGeng
1 Replies
Login or Register to Ask a Question