euse
Enable, disable, and obtain information about Gentoo USE flags. tldr-pages
On Linux
Linux
List active global USE flags
euse --active --globalIdentifyList active local USE flags
euse --active --localIdentifyEnable a global USE flag
sudo euse --enable use_flagIdentifyDisable a global USE flag (put a '-' sign in front of the USE flag)
sudo euse --disable use_flagIdentifyRemove a global USE flag
sudo euse --prune use_flagIdentify