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# "Features": named groups of settings
All delta options can go under the `[delta]` section in your git config file. However, you can also use named "features" to keep things organized: these are sections in git config like `[delta "my-feature"]`. Here's an example using two custom features:
```gitconfig
[delta]
features = unobtrusive-line-numbers decorations
whitespace-error-style = 22 reverse
[delta "unobtrusive-line-numbers"]
line-numbers = true
line-numbers-minus-style = "#444444"
line-numbers-zero-style = "#444444"
line-numbers-plus-style = "#444444"
line-numbers-left-format = "{nm:>4}┊"
line-numbers-right-format = "{np:>4}│"
line-numbers-left-style = blue
line-numbers-right-style = blue
[delta "decorations"]
commit-decoration-style = bold yellow box ul
file-style = bold yellow ul
file-decoration-style = none
hunk-header-decoration-style = yellow box
```
<table><tr><td><img width=400px src="https://user-images.githubusercontent.com/52205/86275048-a96ee500-bba0-11ea-8a19-584f69758aee.png" alt="image" /></td></tr></table>
The environment variable `DELTA_FEATURES` can used to enable features from the command line: it should be set to a space-separated string of feature names.
If you precede this with a `+` symbol, then the features are _added_ to those configured elsewhere, instead of replacing them.
This is very useful, for example to temporarily switch delta to side-by-side mode you can do
```
export DELTA_FEATURES=+side-by-side
```
and to undo that:
```
export DELTA_FEATURES=+
```
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