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How to delete particular rows from a file

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Top Forums Shell Programming and Scripting How to delete particular rows from a file
# 1  
Old 06-02-2008
Tools How to delete particular rows from a file
Hi
I have a file having 1000 rows. Now I would like to remove 10 rows from it. Plz give me the script.

Eg:
input file like
4 1 4500.0 1
5 1 1.0 30
6 1 1.0 4500
7 1 4.0 730
7 2 500000.0 730
8 1 785460.0 45
8 7 94255.0 30
9 1 31800.0 30
9 4 36000.0 30
10 1 15000.0 30
11 1 100000.0 30
12 1 20000.0 2
12 2 10000.0 30
12 3 5000.0 20

now we have to delete following rows
8 7 94255.0 30
12 2 10000.0 30
8 1 785460.0 45
12 3 5000.0 20
# 2  
Old 06-02-2008
What are the criteria for deletion? man grep
# 3  
Old 06-02-2008
First two columns should match
# 4  
Old 06-02-2008
Code:
egrep -v '^(8 7|12 3)' file

# 5  
Old 06-02-2008
But the modifications are huge amount (>500), it is not possible. Can u given with complete script with sed
# 6  
Old 06-02-2008
Code:
sed -e '/^8 7 /d' -e '/^12 3 /d' file

Perhaps you would be better served by reading the manual page than by hoping somebody will solve this problem for you, especially if you requirements are communicated haphazardly.
Last edited by era; 06-02-2008 at 06:18 AM.. Reason: Added spaces after the first two columns
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