How to rewrite a existing value in a column inside a file?

Shell Programming and Scripting
1

I am having 4 field in a file
name age date status
i want to update or rewrite a value of status with another value
how it can be done
i used awk & sed but it shows result but not updating in original file

help me out...
Thanks

2

use 'ed'.

3

Or the -i option for sed if it exists.
see

man sed
4

can you give more details.you can use cut and paste

5

name:age:girlfriend
aa:11:yes
bb:22:yes
cc:33:no
dd:44:no
ee:55:yes

I want to change the cc, the status of girlfriend to yes.

Find cc, and then change! how can i do this?