Need unix commands to delete records from one file if the same record present in another file...
just like join ... if the record present in both files.. delete from first file or delete the particular record and write the unmatched records to new file..
tried with grep and while loop... but no luck... can anyone help on this?
show, what you tried so far ?
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tried with the below codes for getting the unmatched records... but the issue here is while loop will return unmatched records for every loop ... I need only a single output which it should contain only unmatched records
while read a ; do
grep -v "^${a}$" a.file;
done < b.file
a.file --target file
b.file--- required records to be matched
cp a.file a.file.orig
while read a ; do
grep -v "^${a}$" a.file > /tmp/tmp.out
mv /tmp/tmp.out a.file
done < b.file
got the expected result....very thanks kamaraj 
How about:
grep -vxFf b.file a.file
working fine....thanks