find matching text and replace next line

Question

I\'m trying to find a line in a file and replace the next line with a specific value. I tried sed, but it seems to not like the \\n. How else can this be done?

The f

Answer 1

One way: Sample file

$ cat file
Cygwin
Unix
Linux
Solaris
AIX

Using sed, replacing the next line after the pattern 'Unix' with 'hi':

$ sed '/Unix/{n;s/.*/hi/}' file
Cygwin
Unix
hi
Solaris
AIX

For your specific question:

$ sed '/ConnectionString<\/key>/{n;s/.*<\/string>/NEW STRING<\/string>/}' your_file
ConnectionString
NEW STRING