Shell Programming and Scripting

I am trying to compare two file and make changes where ever its different.

for example:

Contents of file1
IP=192.165.89.11
NM=255.255.0.0
GW=192.165.89.1

Contents of file2
IP=192.165.89.11
NM=255.255.255.255
GW=192.165.89.1

NOTE HERE THAT NM IS DIFFERENT

So i want the changes in file1
So final output for file1 should be
IP=192.165.89.11
NM=255.255.255.255
Gw=192.165.89.1


Can u help me out with the script

Exactly wher and how you expect the output to be..

is it like always the NM should get replace with 2nd file or is it always the file contains 3 data that needs to compare?

can you little bit more..

Thanks
Sha

If you want the 2 files to be identical, why don't you just make a copy the file?

Regards

I want the output in file1
its not that NM should be replaced. It can be any of them.
Thanks
Sha[/quote]

Code:

sed -e 's@^\([A-Za-z0-9]\+=\)\(.*\)@s/^\1.*/\1\2/@' file2 | sed -f - -i file1

HI.. Check the below code for compare two files.

rm -f c.txt
t=`sdiff a.txt b.txt | grep "|" | wc -l`
if [ $t -eq 0 ]
then
echo "File are same"
else
echo "Hi"
sdiff a.txt b.txt | grep "|" | nawk '{
s = sprintf("%s/%s/g",$1,$3);
print s;
}' >> c.txt

cnt=1
str=" "
for i in `cat c.txt`
do
if [ "$cnt" -eq "1" ]
then
cnt=`expr $cnt + 1`
sed 's/'"$i"'' a.txt >> d.txt
else
cnt=`expr $cnt + 1`
sed 's/'"$i"'' d.txt >> d.txt
fi
done

p=`cat a.txt | wc -l | awk '{print $1}'`
echo $p
tail -$p d.txt > c.txt
rm -f d.txt
fi

Note:
Above code works only when both the files are same line.

Hey u can use in simple version like this,

File.awk :
BEGIN {
FS=":"
}
FNR == NR { if (FNR==1) file1=FILENAME; arr[NR]=$0; next }
{
if ($0 != arr[FNR])
printf("%s\n", $0)
else
printf("%s\n",arr[FNR])
}

To run the above awk,

nawk -f File.awk << File 1 >> << File 2 >>

Redirect the above output to <<File 3>>

Then finally mv the File 3 to File 1.