Delete function

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# 1  
Old 08-16-2001
Delete function

I need to delete a certain data in a file. May I know how to do it by using awk, sed any shell command?

For example, i have a file details.dat. The user will search in that file for a particular field and if match, he will delete the whole record. Do you know how to do it?

Last edited by Ohji; 08-16-2001 at 09:27 PM..
# 2  
Old 08-16-2001

Can you be more specific?

# 3  
Old 09-21-2001
CPU & Memory similar thing.....

I too have a similar requirement.
i have a text data file. in that i shall search for some words such as names. if found.. i have to delete the whole line. how can i do that using sed or awk or is there any other command that could do that.
# 4  
Old 09-22-2001
sed -e /green/d <inputfile >outputfile
will make a copy of inputfile with all the lines containing "green" removed.
# 5  
Old 09-24-2001
sed : replacement of file

Thank U very much.. by the way.. is there any way to do the same without creating a new file and deleting the old file?
I mean to edit the same file with one command.Smilie
# 6  
Old 09-25-2001
As far as I believe it should be easier to do with a script than with a single command.

And just to be akward, may I suggest that it is possible to do using grep as well....

just use:

#Script to remove line that contains a pattern

if [ $# \< 2 ]; then exit; fi
#if less than two arguments, exit script

if  [ $# = 3 ] ; then
#if 3 args, then third is the output filename

elif [ $# = 2 ] ; then
#if 2 args then input is also output
#but a temp file is needed

else echo Too many arguments!!!;

#output all lines that DO NOT contain string to file
grep -v $1 $2 >$OFILE

if [ $# = 2 ]; then
#if only 2 args rename temp file to input filename
mv "$2"new $2;


I have not tried this on many systems, so it will prob need tweaking....
# 7  
Old 09-25-2001
Bug thanks

Thanks Ghoti,
I shall try that.

by the way.. I have to do this for more files.. that I thought to use a loop.. but I forgot to use that can anybody help me?
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