Shell Programming and Scripting

HELLO
I am new in shell bash script>
I have two text files.They contain same datas.
I want to change some text in two files.If I changed in one file.Then I want to change another same file without using vieditor.Iwant to change another file by using shell script
for example
file1
hello
good morning
file2

hello
good morning

then i changed contents of file1 like this
hello
good evening
then i want to change file2the samechanges in file1 by using shellscript.
could you help me........

Why not just copy file1 to file2?

no.it is not good aways copy to one.I think you didn't understand my question.IF i change one text in a file1.Then i also want same change in file2.

---------- Post updated at 08:59 AM ---------- Previous update was at 08:48 AM ----------

Hello
I think you didn't understand my question.THe files are containing same text.But if Ichange one word in afile1,I want same change in file2.

And why isn't copy a good Idea?

Another approach may be using SymLinks...

Hello
It's ok.
have a look my files one is text file.
and another is shell file.
this is my shell file
!/bin/sh
cat>>DNS_Registry<<!
$TTL 3600
@ IN SOA ns2.isgroup.sr. admin.isgroup.sr. (
2012031701 ; Serial
10800 ; refresh after 3hours
3600 ; retry after 1 hour
604800 ; expire after a week
300 ; negative response TTL
)
;DNS Servers, NS, ns2.isgroup.sr.
; Mail servers, MX, 5mail
localhost,A, 10.2.2.4
;0-19 servers
tyra, A, 10.2.2.1
grace, A, 10.2.2.2
ariadne,A, 10.2.2.3
mail, A, 10.2.2.4
;ftp, A, 10.2.2.4
ldap, A, 10.2.2.4
ns2, A, 10.2.2.4
www, A, 10.2.2.4
!
If i execute this file i got the file DNS_Registry
Then I change something in DNS_Registry text file.Iwant to getthe same change in a shellfile
ex:IN a DNS_Registry file ichanged something like that
mail, A, 10.2.2.5
THEN I WANT THIS SAME CHANGE IN SHELL FILE.
SO I WANT SHELL SCRIPT

If you have
datafile1 = your registry data
then, cp datafile1 to datfile2
make your changes to datafile1
use a diff command to show before/after changes
then this could be used with a script to sed your changes in script

Does that logic make sense?

Hi vidhun.v:

I imagine there's something preventing you from simply editing the shell script and executing it to regenerate the DNS_Registry file, instead of the other way around.

No offense, but this setup sounds like a mess. You have file A whose data is used to create file B which if changed must then be used to modify file A. The answer to this problem is probably stepping back and reengineering the solution at a higher level. Ideally, there should be one and only one authoritative source for the data. Editing is only done on this one source and all other files that make use of it either include it or are generated from it.

Good Luck,
Alister