TUHS February 2021

tuhs@tuhs.org

98 participants
55 discussions

by Grant Taylor

Hi, As I find myself starting yet another project that that wants to use ANSI control sequences for colorization of text, I find myself -- yet again -- wondering if there is a better way to generate the output from the code in a way that respects TERMinal capabilites. Is there a better / different control sequence that I can ~> should use for colorizing / stylizing output that will account for the differences in capabilities between a VT100 and XTerm? Can I wrap things that I output so that I don't send color control sequences to a TERMinal that doesn't support them? -- Grant. . . . unix || die

3 years, 1 month

Re: [TUHS] Abstractions

by Nelson H. F. Beebe

The recent discussions on the TUHS list of whether /bin and /usr/bin are different, or symlinked, brought to mind the limited disk and tape sizes of the 1970s and 1980s. Especially the lower-cost tape technologies had issues with correct recognition of an end-of-tape condition, making it hard to span a dump across tape volumes, and strongly suggesting that directory tree sizes be limited to what could fit on a single tape. I made an experiment today across a broad range of operating systems (many with multiple versions in our test farm), and produced these two tables, where version numbers are included only if the O/S changed practices: ------------------------------------------------------------------------ Systems with /bin a symlink to /usr/bin (or both to yet another common directory) [42 major variants]: ArchLinux Kali RedHat 8 Arco Kubuntu 19, 20 Q4OS Bitrig Lite ScientificLinux 7 CentOS 7, 8 Lubuntu 19 Septor ClearLinux Mabox Solaris 10, 11 Debian 10, 11 Magiea Solydk Deepin Manjaro Sparky DilOS Mint 20 Springdale Dyson MXLinux 19 Ubuntu 19, 20, 21 Fedora Neptune UCS Gnuinos Netrunner Ultimate Gobolinux Oracle Linux Unleashed Hefftor Parrot 4.7 Void IRIX PureOS Xubuntu 19, 20 ------------------------------------------------------------------------ Systems with separate /bin and /usr/bin [60 major variants]: Alpine Hipster OS108 AltLinux KaOS Ovios Antix KFreeBSD PacBSD Bitrig Kubuntu 18 Parrot 4.5 Bodhi LibertyBSD PCBSD CentOS 5, 6 LMDE PCLinuxOS ClonOS Lubuntu 17 Peppermint Debian 7--10 LXLE Salix DesktopBSD macOS ScientificLinux 6 Devuan MidnightBSD SlackEX DragonFlyBSD Mint 18--20 Slackware ElementaryOS MirBSD Solus FreeBSD 9--13 MXLinux 17, 18 T2 FuryBSD NetBSD 6-1010 Trident Gecko NomadBSD Trisquel Gentoo OmniOS TrueOS GhostBSD OmniTribblix Ubuntu 14--18 GNU/Hurd OpenBSD Xubuntu 18 HardenedBSD OpenMandriva Zenwalk Helium openSUSE Zorinos ------------------------------------------------------------------------ Some names appear in both tables, indicating a transition from separate directories to symlinked directories in more recent O/S releases. Many of these system names are spelled in mixed lettercase, and if I've botched some of them, I extend my apologies to their authors. Some of those systems run on multiple CPU architectures, and our test farm exploits that; however, I found no instance of the CPU type changing the separation or symbolic linking of /bin and /usr/bin. ------------------------------------------------------------------------------- - Nelson H. F. Beebe Tel: +1 801 581 5254 - - University of Utah FAX: +1 801 581 4148 - - Department of Mathematics, 110 LCB Internet e-mail: beebe(a)math.utah.edu - - 155 S 1400 E RM 233 beebe(a)acm.org beebe(a)computer.org - - Salt Lake City, UT 84112-0090, USA URL: http://www.math.utah.edu/~beebe/ - -------------------------------------------------------------------------------

3 years, 1 month

Re: [TUHS] Proliferation of options is great simplification of pipes, really?

by Norman Wilson

To fill out the historical record, the earliest doctype I know of was a shell (not rc) script. From my basement heater that happens to run 10/e: b$ man doctype | uniq DOCTYPE(1) DOCTYPE(1) NAME doctype - guess command line for formatting a document SYNOPSIS doctype [ option ... ] [ file ] DESCRIPTION Doctype guesses and prints on the standard output the com- mand line for printing a document that uses troff(1), related preprocessors like eqn(1), and the ms(6) and mm macro packages. Option -n invokes nroff instead of troff. Other options are passed to troff. EXAMPLES eval `doctype chapter.?` | apsend Typeset files named chapter.0, chapter.1, ... SEE ALSO troff(1), eqn(1), tbl(1), refer(1), prefer(1), pic(1), ideal(1), grap(1), ped(9.1), mcs(6), ms(6), man(6) BUGS It's pretty dumb about guessing the proper macro package. Page 1 Tenth Edition (printed 2/24/2021) doctype(1) is in the 8/e manual, so it existed in early 1985; I bet it's actually older than that. The manual page is on the V8 tape, but, oddly, not the program; neither is it in the V10 pseudo-tape I cobbled together for Warren long ago. I'm not sure why not. The version in rc is, of course, a B-movie remake of the original. Norman Wilson Toronto ON

3 years, 1 month

retro-fuse project

by Jay Logue

Lately, I've been playing around in v6 unix and mini-unix with a goal of better understanding how things work and maybe doing a little hacking. As my fooling around progressed, it became clear that moving files into and out of the v6 unix world was a bit tedious. So it occurred to me that having a way to mount a v6 filesystem under linux or another modern unix would be kind of ideal. At the same time it also occurred to me that writing such a tool would be a great way to sink my teeth into the details of old Unix code. I am aware of Amit Singh's ancientfs tool for osxfuse, which implements a user-space v6 filesystem (among other things) for MacOS. However, being read-only, it's not particularly useful for my problem. So I set out to create my own FUSE-based filesystem capable of both reading and writing v6 disk images. The result is a project I call retro-fuse, which is now up on github for anyone to enjoy (https://github.com/jaylogue/retro-fuse). A novel (or perhaps just peculiar) feature of retro-fuse is that, rather than being a wholesale re-implementation of the v6 filesystem, it incorporates the actual v6 kernel code itself, "lightly" modernized to work with current compilers, and reconfigured to run as a Unix process. Most of file-handling code of the kernel is there, down to a trivial block device driver that reflects I/O into the host OS. There's also a filesystem initialization feature that incorporates code from the original mkfs tool. Currently, retro-fuse only works on linux. But once I get access to my mac again in a couple weeks, I'll port it to MacOS as well. I also hope to expand it to support other filesystems as well, such as v7 or the early BSDs, but we'll see when that happens. As I expected, this was a fun and very educational project to work on. It forced me to really understand what was going in the kernel (and to really pay attention to what Lions was saying). It also gave me a little view into what it was like to work on Unix back in the day. Hopefully someone else will find my little self-education project useful as well. --Jay

3 years, 1 month

Re: [TUHS] Abstractions

by Rudi Blom

Some additions: Systems with /bin a symlink to /usr/bin Digital UNIX 4.0 Tru64 UNIX 5.0 to 5.1B HP-UX 11i 11.23 and 11.31 Systems with separate /bin and /usr/bin SCO UNIX 3.2 V4.0 to V4.2 -- The more I learn the better I understand I know nothing.

3 years, 1 month

Re: [TUHS] Proliferation of options is great simplification of pipes, really?

by Steve Simon

its written in rc(1) and uses plan9 regex which sometimes differ from unix ones a little but there is doctype: http://9p.io/magic/man2html/1/doctype http://9p.io/sources/plan9/rc/bin/doctype -Steve

3 years, 1 month

Proliferation of options is great simplification of pipes, really?

by M Douglas McIlroy

> I can imagine a simple perl (or python or whatever) script that would run > through groff input [and] determine which preprocessors are actually > needed ... Brian imagined such and implemented it way back when. Though I used it, I've forgotten its name. One probably could have fooled it by tricks like calling pic only in a .so file and perhaps renaming .so. But I never heard of it failing in real life. It does impose an extra pass over the input, but may well save a pass compared to the defensive groff -pet that I often use or to the rerun necessary when I forget to mention some or all of the filters.

3 years, 2 months

Proliferation of options is great simplification of pipes, really?

by Will Senn

All, So, we've been talking low-level design for a while. I thought I would ask a fundamental question. In days of old, we built small single-purpose utilities and used pipes to pipeline the data and transformations. Even back in the day, it seemed that there was tension to add yet another option to every utility. Today, as I was marveling at groff's abilities with regard to printing my man pages directly to my printer in 2021, I read the groff(1) page: example here: https://linux.die.net/man/1/groff What struck me (the wrong way) was the second paragraph of the description: The groff program allows to control the whole groff system by command line options. This is a great simplification in comparison to the classical case (which uses pipes only). Here is the current plethora of options: groff [-abcegilpstzCEGNRSUVXZ] [-d cs] [-f fam] [-F dir] [-I dir] [-L arg] [-m name] [-M dir] [-n num] [-o list] [-P arg] [-r cn] [-T dev] [-w name] [-W name] [file ...] Now, I appreciate groff, don't get me wrong, but my sensibilities were offended by the idea that a kazillion options was in any way simpler than pipelining single-purpose utilities. What say you? Is this the perfected logical extension of the unix pioneers' work, or have we gone horribly off the trail. Regards, Will

3 years, 2 months

Re: [TUHS] cut, paste, join, etc.

by M Douglas McIlroy

Will Senn wrote, > join seems like part of an aborted (aka never fully realized) attempt at a text based rdb to me As the original author of join, I can attest that there was no thought of parlaying join into a database system. It was inspired by databases, but liberated from them, much as grep was liberated from an editor. Doug

3 years, 2 months

UNSW batch availability (was Re: Abstractions)

by Ron Young

Hi: I've been following the discussion on abstractions and the recent messages have been talking about a ei200 batch driver (ei.c: https://minnie.tuhs.org/cgi-bin/utree.pl?file=AUSAM/sys/dmr/ei.c). I have access to DtCyber (CDC Cyber emulator) that runs all/most of the cdc operating system. I'm toying with the idea of getting ei200 running. In looking at things, I ran across the following in https://minnie.tuhs.org/cgi-bin/utree.pl?file=AUSAM/READ_ME > The UNSW batch system has not been provided with this > distribution, because of its limited appeal. > If you are unfortunate enough to have a CYBER to talk to, > please contact us and we will forward it to you. Does anyone happen to know if the batch system is still around? thanks -ron

3 years, 2 months

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TUHS February 2021