Re:A deeper introduction to Unix DC
by c0l0 on Monday June 08, 2020 @09:21AM
(#23456237)
dc is worth having installed because of this CLI gem alone:
I've never tried to understand what's really going on to produce the result, but also wouldn't really know where to start - maybe someone in HN's audience can enlighten me? :)
[ Parent
| on HN ]
dc and bc are standard POSIX utils (and also part of busybox for embedded systems) so for most unix-like systems they're installed by default unless you take active measures to exclude them.
POSIX.1-2017 describes the `dc` program as "excluded" from the standard; check https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xcu... for details.
Many GNU/Linux distros (at least Debian and RHEL) install neither `dc` nor `bc` by default, afaik.
Re:A deeper introduction to Unix DC
by yjftsjthsd-h on Monday June 08, 2020 @05:59PM
(#23461283)
> Many GNU/Linux distros (at least Debian and RHEL) install neither `dc` nor `bc` by default, afaik.
Yeah, I recently wrote a script that used bc and immediately discovered that it didn't work on at least Arch Linux (and I think others, although I only seem to have added it to the Arch ansible config...); conveniently, I only needed the most trivial of calculations, so I just shifted to awk, which has better default availability.
Gentoo doesn't include it in the common 'stage3' tarball, either. Which is annoying because it's actually required to compile the linux kernel.
I stand corrected, only bc is included in POSIX.
echo '1033333377708482P' | dc