Append or modify keys in conf files using sed/bash one-liner
- by Jeff
I often have to modify files such as sysctl.conf, and I'm familiar with using sed to replace existing values.
Is there a way to append the new key/value pair to the file if sed wasn't able to replace it?
For instance, using this example: modify config file using bash script
sed -c -i "s/\($TARGET_KEY *= *\).*/\1$REPLACEMENT_VALUE/" $CONFIG_FILE
How could I add the $TARGET_KEY = $REPLACEMENT_VALUE new line to $CONFIG_FILE using the same sed expression with slight changes?
And on a related topic, how can I force creation of $CONFIG_FILE if it didn't exist?
