eix: add page (#4255)

pages/linux/eix.md

@@ -0,0 +1,24 @@
+# eix
+
+> Utilities for searching local Gentoo packages.
+> Update local package cache using `eix-update`.
+
+- Search for a package:
+
+`eix {{package_name}}`
+
+- Search for installed packages:
+
+`eix --installed {{package_name}}`
+
+- Seach in package descriptions:
+
+`eix --description "{{description}}"`
+
+- Seach by package license:
+
+`eix --license {{license}}`
+
+- Exclude results from search:
+
+`eix --not --license {{license}}`