UNIX for Dummies Questions & Answers

Hi,

how to read the 2 files and compare each other in shell script? i have 2 files test1 and test2, both files contains 20 character records.we have to compare file 1 records with file2, if exists then reject the record else we have to append it to test2 file. in file test1 around 100 single column records are there. and test2 around 50000 single column records.

how can we do in shell script?

ex: test1
burningburning21sstt
ex:test2
burningburning21eett

we need to compare only first 16 letters of the record like
if test1.burningburning21 = test2.burningburning21 then reject.


Thanks in advance

Have you tried

Code:

$ diff filename1 filename2

?

You might need to write a script to loop all the contents in a file if there is any change.

Hi,
Try the below script. Customize, if required


for line in `cat test1.lst|cut -c1-16`
do
grep -i $line test2.lst >/dev/null
exitcode=$?
if [ $exitcode = 0 ]; then
echo "$line : String Exists"
else
echo "String does not exists, hence appending in test2 file"
echo $line >> test2.lst
fi
done