Modify config file using bash script

Question

I'm writing a bash script to modify a config file which contains a bunch of key/value pairs. How can I read the key and find the value and possibly modify it?

Accepted Answer

A wild stab in the dark for modifying a single value:

```
sed -c -i "s/$$TARGET_KEY *= *$.*/\1$REPLACEMENT_VALUE/" $CONFIG_FILE
```

assuming that the target key and replacement value don't contain any special regex characters, and that your key-value separator is "=". Note, the -c option is system dependent and you may need to omit it for sed to execute.

For other tips on how to do similar replacements (e.g., when the REPLACEMENT_VALUE has '/' characters in it), there are some great examples here.

Modify config file using bash script

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