Edit/update config file with Applescript??

Question

am trying to read the file and then trying to change the values of the same with permissions, pls suggest how to write the same file with permissions.
The below script gives me the values as shown below, i need to change those values like aaaaa to 1, pls suggest.
set fileContents to {}
set x to ""
set filepath to POSIX path of "Macintosh HD:Library:Application Support:Macromedia:abc.cfg"
try
    open for access filepath
    set fileContents to (read filepath)
    close access the filepath
on error
    return false
end try
fileContents
output :
"aaaaa=0
bbbbbbb=0

Answer 1

If you want to write to the file you need to open it with write permissions
open for access filepath with write permission
Ideally you should store the result of that command as a reference to the opened file:
set myFile to open for access filepath with write permission
now you can read the data:
set fileData to read myFile
You can erase the file by setting the EOF to 0:
set eof myFile to 0
(otherwise writing to the file appends data, rather thatn overwriting it)
You can write data to the file:
write "blah blah blah" to myFile
and close it when you're done:
close access myFile