How to remove comments from a config file with sed

How to remove comments from a config file with sed

Strip comment lines and inline comments from configuration files using sed regex patterns.

Prerequisites

• sed installed.

Step-by-Step: Remove Comments with sed

1. Remove lines that start with # (full-line comments):

   sed '/^#/d' config.conf

2. Remove lines that start with # and blank lines:

   sed '/^#/d; /^$/d' config.conf

3. Remove inline comments (everything after # on a line):

   sed 's/#.*$//' config.conf

4. Combine all three — remove comment lines, blank lines, and inline comments:

   sed '/^#/d; /^$/d; s/#.*$//' config.conf

5. Apply in-place:

   sed -i '/^#/d; /^$/d; s/#.*$//' config.conf