How to compare file leaving certain filelds?

Linux and Unix-Like Red Hat
1

How to compare two files leaving certain fields, using diff command the
entire file is being compared.

Can any one please help.

2

Show the input you have and the output you want.

3

the file which i have to compare is like this

VERSION = 2
SWI_ID = Ericsson3GSGSN
FILE_SEQ_NBR = 695
TOTAL_RECS = 233
FIRST_DTTM = 2008-07-21 16:42:12
LAST_DTTM = 2008-07-21 17:15:58
ORIG_FILE_NAME = UN00695.chg
CONVERTED_REC_STATS = MOC:150;MTC:83
REJECTED_REC_STATS = REJ:0
DISCARDED_REC_STATS =
ADDED_RECS_STATS  = 0
ADD_DUP_CHK_KEY  =
GEN_FIELD_NAME_1  =
GEN_FIELD_NAME_2  =

i dont want the LAST_DTTM field to be compared with a similar type of files .

4

That's half the input, and none of the output. Can you show the other half of the input, and the matching output please?

5

the another input file is similar to the 1st input file which i have shown
only last_dttm is different . i have to compare these file using a shell script
and echo that both the files are similar.

6

Try this

diff -y -b --suppress-common-lines file file1 | grep -v LAST_DTTM
DISCARDED_REC_STATS =                          |    DISCARDED_REC_STATS = 7

Works with diff (GNU diffutils) 3.2 on linux.