Delete line in text file


 
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# 1  
Old 08-31-2005
Delete line in text file

Hi,
How do I go about deleting a line in a text file. I have used grep to find a particlular word, now how do I delete the line?

so far I got:

grep -i $keyword file.txt
# 2  
Old 08-31-2005
Did you use the search within this forum ?

Please do so. The rules of the forum says

(5) Search the forums database with your keywords before asking.

Vino
# 3  
Old 08-31-2005
sorry about that, wont happen again.

so if I use:

sed -e '/$keyword/d' file.txt

would that delete a user entered $keyword from a text file?
# 4  
Old 08-31-2005
When you do that, you will not see lines containing the $keyword on the terminal. But that wouldnt delete the keyword from the file. Because you are not redirecting the output to a file.

If you need the change to be permanent, then use

Code:
sed -e '/$keyword/d' file.txt >file.txt.new

If the keyword contains spaces and special characteres, you need to put the -e script within double quotes.

Code:
sed -e "/$keyword/d" file.txt >file.txt.new

Vino
# 5  
Old 08-31-2005
cheers vino, thanks for your help.
# 6  
Old 11-07-2007
I hate to bring up a dead topic but its really relavant to what I need

I need to compare 2 files and output what is the same between the 2 into a 3rd file

old.txt = abc def ghi
new.txt = abc ghi jkl
final.txt = abc ghi

Here is what I have.. Not sure why it won't work. Is it because my diff doesn't get just "jkl def"

Quote:
#!/bin/sh

keyword='diff old.txt new.txt'
sed -e '/$keyword/d' old.txt > final.txt
# 7  
Old 12-16-2008
But if i want to do this is in a loop

sed -e "/$keyword/d" file.txt >file.txt.new

the file.txt.new will have all the matching lines as in file.txt???
How will I do that??
 
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