Remove certain lines from file based on start of line except beginning and ending


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Remove certain lines from file based on start of line except beginning and ending
# 1  
Old 02-20-2013
Remove certain lines from file based on start of line except beginning and ending

Hi, I have multiple large files which consist of the below format:

Quote:
00..................
06..................
06..................
06..................
06..................
70..................
80..................
00..................
06..................
06..................
06..................
06..................
70..................
80..................
00..................
06..................
06..................
06..................
06..................
70..................
80..................
etc
I am trying to write an awk or sed script to remove all occurrences of the 00 record except the first and remove all of the 80 records except the last one.

Any help would be greatly appreciated.
# 2  
Old 02-20-2013
Is this what you want...?

Code:
awk 'NR==1
s=0
NR>1 && !/^00/
/^00/{s=1}
END{if(s){print}}' file

This User Gave Thanks to pamu For This Post:
# 3  
Old 02-20-2013
Thanks for your reply.

Yes that is along the lines of what i need.

That script removes the 00 records except the 1st

I also need it to remove all the 80 records but leave the last one as it is.

Any ideas....?
# 4  
Old 02-20-2013
Quote:
Originally Posted by nwalsh88
I also need it to remove all the 80 records but leave the last one as it is.

Any ideas....?
Forgot to add this condition..

try

Code:
awk 'NR==1
s=0
NR>1 && !/^00|^80/
/^80/{s=1}
END{if(s){print}}' file

# 5  
Old 02-20-2013
It's getting there now

That edit to the script removes all the 80 records including the last one.

How could i get it to leave the last 80 record there??
# 6  
Old 02-20-2013
Try now

Code:
awk '!s && /00/{s=1;print}
/80/ && a{K=$0;for(i=1;i<=a;i++){print X[i]};a=0}
!/^00|80/{X[++a]=$0}
END{if(K){print K}
for(i=1;i<=a;i++){print X[i]}
}' file

# 7  
Old 02-20-2013
Same again pamu

Everything is perfect apart from the final line of the file which should be the 80 record but is the 70 record
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Remove lines ending with a certain character

I have a file of a content like this: abc_bla -def 800 abc_bla -def 802 abc_bla -def 804 abc_bla -def 806 abc_bla -def 808 abc_bla -def 810 abc_bla -def 812 abc_bla -def 814 ... abc_bla -def 898 abc_bla -def 900 abc_bla -def 902 abc_bla -def 904 ... abc_bla -def 990 abc_bla -def... (7 Replies)
Discussion started by: maya3
7 Replies

2. Shell Programming and Scripting

awk to remove lines that do not start with digit and combine line or lines

I have been searching and trying to come up with an awk that will perform the following on a converted text file (original is a pdf). 1. Since the first two lines are (begin with) text they are removed 2. if $1 is a number then all text is merged (combined) into one line until the next... (3 Replies)
Discussion started by: cmccabe
3 Replies

3. Shell Programming and Scripting

Add text at start and ending of every line

Hi all, Is there other way to Add text at start and ending of every line? here my script: cat file.txt |awk '{print "<p align=\"justify\">"$0"</p>"}' but the problem they put including white spaces, I only need those line have a sentence or text not an skip all have empty string or have... (7 Replies)
Discussion started by: lxdorney
7 Replies

4. Shell Programming and Scripting

Remove duplicate lines from file based on fields

Dear community, I have to remove duplicate lines from a file contains a very big ammount of rows (milions?) based on 1st and 3rd columns The data are like this: Region 23/11/2014 09:11:36 41752 Medio 23/11/2014 03:11:38 4132 Info 23/11/2014 05:11:09 4323... (2 Replies)
Discussion started by: Lord Spectre
2 Replies

5. Shell Programming and Scripting

Reading line by line from live log file using while loop and considering only those lines start from

Hi, I want to read a live log file line by line and considering those line which start from time stamp; Below code I am using, which read line but throws an exception when comparing line that does not contain error code tail -F /logs/COMMON-ERROR.log | while read myline; do... (2 Replies)
Discussion started by: ketanraut
2 Replies

6. UNIX for Dummies Questions & Answers

Remove lines in a positional file based on string value

Gurus, I am relatively new to Unix scripting and am struck with a problem in my script. I have positional input file which has a FLAG indicator in at position 11 in every record of the file. If the Flag has value =Y, then the record from the input needs to be written to a new file.However if... (3 Replies)
Discussion started by: gsam
3 Replies

7. UNIX for Dummies Questions & Answers

how to remove lines ending with '*'

I have a file where some lines end with '*'. I would like to remove those lines ending with '*'. inFile: a b* c d*outFile: a cThank you (7 Replies)
Discussion started by: jdhahbi
7 Replies

8. Shell Programming and Scripting

How to fetch rows based on line numbers or based on the beginning of a word?

I have a file which will have rows like shown below, ST*820*316054716 RMR*IV*11333331009*PO*40.31 REF*IV*22234441009*xsss471-2762 DTM*003*091016 ENT*000006 RMR*IV*2222234444*PO*239.91 REF*IV*1234445451009*LJhjlkhkj471-2762 </SPAN> DTM*003* 091016 RMR*IV*2223344441009*PO*40.31... (18 Replies)
Discussion started by: Muthuraj K
18 Replies

9. Shell Programming and Scripting

Remove lines based on contents of another file

So, this issue is driving me nuts! I was hoping to get a lending hand here... I have 2 files: file1.txt contains: this is example1 this is example2 this is example3 this is example4 this is example5 file2.txt contains: example3 example5 Basically, I need a script or command to... (4 Replies)
Discussion started by: bashshadow1979
4 Replies

10. Shell Programming and Scripting

Remove white space at the beginning of lines

Hi! I store some data obtained with grep or awk in a file. The problem is that some lines have white space at the begining : line1 line2 line3 I use something like grep WORD INFILE >> OUTFILE awk >> OUTFILE I would love if it were possible to remove the white whitout parsing the... (4 Replies)
Discussion started by: tipi
4 Replies
Login or Register to Ask a Question