> Those are not provided by GNU grep, they are an Arch thing No, they're a GNU grep thing. GNU grep 3.7: https://git.savannah.gnu.org/cgit/grep.git/tree/src/e

> Those are not provided by GNU grep, they are an Arch thing No, they're a GNU grep thing. GNU grep 3.7: https://git.savannah.gnu.org/cgit/grep.git/tree/src/egrep.sh?h=v3.7 https://git.savannah.gnu.org/cgit/grep.git/tree/src/egrep.sh... GNU grep 3.8 (with the warning): https://git.savannah.gnu.org/cgit/grep.git/tree/src/egrep.sh?h=v3.8 https://git.savannah.gnu.org/cgit/grep.git/tree/src/egrep.sh... And you can see that the Arch package isn't doing anything special to add it: https://github.com/archlinux/svntogit-packages/blob/packages/grep/trunk/PKGBUILD https://github.com/archlinux/svntogit-packages/blob/packages... In general, Arch avoids doing Arch-specific things and prefers to provide vanilla upstream packages, a lot more than other distros avoid doing distro-specific things.