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Urgent help required in deleting a line without opening a file usinga shell script

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# 1  
Old 07-20-2006
Urgent help required in deleting a line without opening a file usinga shell script
Hi,

I need a help in deleting a line matching a particular pattern in a file using shell script without opening the file. The file is a .c/.cpp file. Is it possible?

Thanks
# 2  
Old 07-20-2006
Quote:
Originally Posted by naan
Hi,

I need a help in deleting a line matching a particular pattern in a file using shell script without opening the file. The file is a .c/.cpp file. Is it possible?

Thanks
Hi naan, you can overright the file.
eg. I have a file name.cpp & i wanna delete line with a text "test file". then do it like this

cat name.cpp | grep -v "test file" > name.cpp

"grep -v "test file" will display the name.cpp without line containing words "test file" & " >name.cpp" will overright the previous file

Regds,
Girish
# 3  
Old 07-20-2006
Bug delete line with Overrighting the file
Hi naan, you can delet th eline by overrighting the file.
eg. I have a file name.cpp & i wanna delete line containing words "test file". then do it like this

cat name.cpp | grep -v "test file" > name.cpp

"grep -v "test file" will display the name.cpp without line co Smilie ntaining words "test file" & " >name.cpp" will overright the previous file

Regds,
Girish
# 4  
Old 07-20-2006
Quote:
Originally Posted by girish.karulkar
cat name.cpp | grep -v "test file" > name.cpp
That command will wipe out the complete file.

You should be doing
Code:
grep -v "test file" name.cpp > name.cpp.new
mv name.cpp.new name.cpp

# 5  
Old 07-20-2006
Quote:
Originally Posted by vino
That command will wipe out the complete file.

You should be doing
Code:
grep -v "test file" name.cpp > name.cpp.new
mv name.cpp.new name.cpp

Yes. I do agree !
# 6  
Old 07-20-2006
Additional help
Thanks a lot for the input...So can we use the same solution while writing a batch DOS program to delete a particular line from a set of files within a folder so that it recursively goes and delete the line in all the files. Smilie
# 7  
Old 07-20-2006
I think by Dos batch program you mean a shell script, if that is the case then try this:
Code:
#! /bin/ksh

for i in *.cpp;
do
grep -v "test file" $i > $i.new
mv $i.new $i
done

Regards,
Tayyab
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