I have a pattern in a file which includes a newline:
client_encryption_options:
enabled: false
I want to set enabled to true. But the enabled has to be the one below
client_encryption_options.
grep doesn't allow me to search for multiline. How can I achieve this?
Well, grep would additionally not allow you to make modifications, so that utility is out of the picture from the start.
Using GNU sed instead:
$ sed '/^client_encryption_options:/,+1s/enabled:.*/enabled: true/' file
This will find the line starting with the string client_encryption_options: and will apply a substitution to it and the following line. The substitution will replace the string enabled: and everything following it on the same line with enabled: true.
The substitution will be applied to both lines, but since the pattern enabled:.* isn't found on the first line, it will remain unchanged. The second line will be changed unconditionally (regardless of the text after enabled:).
With sed:
sed '/client_encryption_options:/{n;s/false/true/;}'
n is the command to get the next line into the pattern space (after having printed and discarded the current pattern space content), s is to substitute.
