In the 1st post in this thread you said File2 (note the uppercase F) contains the code:

Code:

UID ="admin"
PWD ="password"

You haven't told us what OS or shell you're using, but there are at least two problems here:If you set the contents of file2 to be valid shell variable assignments as clx suggested:

Code:

UID="admin"
PWD="password"

(Note that there are no spaces around the = in either of these commands), then the following commands in file3 should do what you want:

Code:

#!/bin/ksh
. file2
sed 's/UID.*".*".*PWD.*".*"/UID = "'"$UID"'"  PWD = "'"$PWD"'"/' file1 > file1.$$ && mv file1.$$ file1

I generally prefer using the Korn shell, but this should work with any POSIX conforming shell or any shell that accepts basic Bourne shell syntax.