This an short tutorial with using command 'replace' to modify your DNS files zones from OLD IP to NEW IP
DESCRIPTION
The replace utility program changes strings in place in files or on the standard input.
Invoke replace in one of the following ways:
shell> replace from to [from to] ... -- file [file] ...
shell> replace from to [from to] ... < file
Requirement :-
Must be logged as root
[root@host named]# cd /var/named
[root@host named]# replace "replace from old ip" "to new ip" -- *.db
Piece of cake method, but very helpful
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