search line by line and modify file

[krajeevk10]

file contain below text

[a]
server = abc
tapeserver = 123
filer = 456


[b]
server = def
tapeserver = 123
filer = 456

[c]
server = ghk
tapeserver = 123
filer = 456


i want to modify only lines related to [a] , i am looking [a] output like below ..

[a]
server = xyz
tapeserver = 666
filer = 999

[dev7060]

- There is no way of insertion into the middle of the file than re-writing it. The changes can be saved to a temporary file and later, it can be renamed.

- Write the first four changed lines to a temporary file. Then start reading from the original file and skip any operation for these lines. The later part of the file can be copied to the temporary file. And then rename the temporary file.

[dwblas]

It is simple to find lines that start with "server". What problems are you having with your code to do this?

[krajeevk10]

Hello, good day

i Need to change server,tapeserv er,filer for only Set [a] , remaining sets no need to modify, also set [a] line not starting from zero'0', it is some where in file ,so am facing some difficult to apply logic how to search from set [a] only ,also followed 3 lines need to modify ..