On Thu, Nov 16, 2017 at 11:55:07PM -0800, Shawn Landden wrote: > On Thu, Nov 16, 2017 at 11:39 PM, Xen <l...@xenhideout.nl> wrote: > > > Julian Andres Klode schreef op 14-11-2017 8:50: > > > > * You should not depend on grep, sed, coreutils, they are Essential. > >> > > > > Can I ask what this means? > > > > I actually assume that these dependencies are not *required*, not that you > > can't use the tools. > > Required: yes. The highest priority. sysvinit was Required: yes until > systemd came along https://www.debian.org/doc/debian-policy/#priorities
What it actually means is that you don't have to declare them in Depends fields. And required is a priority, that's distinct. Essential basically is the set of packages dpkg needs for its own operation. > > Speaking of, I can't use 'apt-get indextargets' from shell and had to > rewrite in ruby, because sed doesn't not support lazy matching, and I don't > know how else to match NOT \n\n. (it also doesn't seem to support multiples > of submatches.) Old regular expression implementations are showing their > age (not to mention perl's non-regular features). Ruby is just a major no go. At that system level, the best choices are Perl, Shell, and C++. Maybe Python (on Ubuntu it's in ubuntu-minimal, but in Debian it's only used by standard priority and less, perl on the other hand is required and essential). Ruby has the lowest priority - optional. -- Debian Developer - deb.li/jak | jak-linux.org - free software dev Ubuntu Core Developer de, en speaker
