What this template solves
This template is a focused landing page for uncomment-lines workflows where the same config directive is prefixed with # and needs to be enabled quickly.
Sample input
# DB_HOST=localhost
# DB_PORT=5432
APP_ENV=prodPrompt to start from
Uncomment lines that start with # in the config file
Expected command
sed 's/^#\s*//'Tags
Best for
- Enable multiple commented options in env or ini files.
- Activate sample nginx or app config blocks.
- Convert documentation snippets into runnable examples.
How to use this template
- 1Check that the lines to enable all start with the same comment prefix.
- 2Use the uncomment-lines sed pattern as the starting command.
- 3Preview the rewritten text, then apply the in-place variant for your operating system.
Template FAQ
Can sed uncomment many config lines at once?
Yes. If the lines start with a consistent comment marker like `#`, a pattern such as `sed 's/^#\s*//'` can enable them in bulk. This works well for env files, ini files, and config snippets.
When should I use uncomment-lines instead of editing config by hand?
Use it when a repeated block of settings has to be enabled together. It is faster, reduces missed lines, and gives you a reusable template for similar configuration tasks later.
Related templates
Explore nearby sed workflows that target similar replace, cleanup, filtering, or rewrite tasks.
Remove leading comment markers
RewriteRemove the leading # and following spaces from each line.
sed 's/^#\s*//'Replace path prefixes
ReplaceReplace an old path prefix with a new one across many lines.
sed 's#/srv/legacy#/srv/current#g'Delete comment lines
FilterDelete lines that start with comment markers such as #.
sed '/^#/d'