lsahn-gh

unix-v6

C2018–2024

lsahn-gh / unix-v6

unix-v6

UNIX 6th Edition Kernel Source Code

Systems & Infrastructure

Explore on GitHub Read Hacker News discussions

5Distinct people

6Mentions

0Explicit recommenders

556GitHub stars

REPOSITORY AT A GLANCE

What to know before exploring

What it is

UNIX 6th Edition Kernel Source Code

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 5:04:57 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year6 dated mentions

Observed mentions: 2018-12-29 23:02:32 UTC to 2024-07-24 19:15:05 UTC.

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges

UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
Period	Start (UTC)	End (exclusive, UTC)	Mentions	Comments
2018	2018-01-01 00:00:00 UTC	2019-01-01 00:00:00 UTC	1	1
2019	2019-01-01 00:00:00 UTC	2020-01-01 00:00:00 UTC	0	0
2020	2020-01-01 00:00:00 UTC	2021-01-01 00:00:00 UTC	1	1
2021	2021-01-01 00:00:00 UTC	2022-01-01 00:00:00 UTC	2	2
2022	2022-01-01 00:00:00 UTC	2023-01-01 00:00:00 UTC	0	0
2023	2023-01-01 00:00:00 UTC	2024-01-01 00:00:00 UTC	1	1
2024	2024-01-01 00:00:00 UTC	2025-01-01 00:00:00 UTC	1	1

What Hacker News says

6 sources

yjftsjthsd-h·Jul 24, 2024

The post you're replying to didn't say "on Linux" - IIRC, unix ps worked by reading /dev/kmem or so Edit: My mistake, it was /dev/mem - https://github.com/lsahn-gh/unix-v6/blob/master/source/s2/ps...

In Hiding Linux Processes with Bind Mounts

kragen·Feb 16, 2023

in 6th edition it was already 14 https://github.com/memnoth/unix-v6/blob/master/sys/ken/nami.... https://github.com/memnoth/unix-v6/blob/master/sys/param.h#L... i guess this 'edition zero' is from 01971, and 6th edition is 01975

In Unix Edition Zero (1971)

kragen·Mar 21, 2021

Hmm, wasn't # the default erase character for teletype-era Unix? And @ the "kill" character (like modern ^U)? That would have made them a little annoying to type—not annoying enough to keep them from being used for cpp, though, and https://github.com/memnoth/unix-v6/blob/master/sys/dmr/tty.c... suggests that you could type \#. (There was no "lnext" yet; it was just hardcoded to backslash.) The actual input erase handling is on https://github.com/memnoth/unix-v6/blob/master/sys/dmr/tty.c.... The relevant struct member is declared in https://github.com/memnoth/unix-v6/blob/master/sys/tty.h#L35 and initialized to CERASE in each tty driver, for example, https://github.com/memnoth/unix-v6/blob/master/sys/dmr/kl.c#..., using the macro defined in https://github.com/memnoth/unix-v6/blob/master/sys/tty.h#L48. So by default # was special, just

Read the rest

to the kernel tty driver, not the shell.

In Do not use redirection characters in your shell prompt

jxy·Jan 6, 2021

You are probably right. The one in FreeBSD is from NetBSD: https://svnweb.freebsd.org/base/head/usr.bin/units/units.c?v... The NetBSD version is from Adrian Mariano: http://cvsweb.netbsd.org/bsdweb.cgi/src/usr.bin/units/units.... The one in Plan9 is in yacc: http://9p.io/sources/plan9/sys/src/cmd/units.y This GitHub repo claims to be V6: https://github.com/memnoth/unix-v6/blob/master/source/s2/uni...

In GNU Units

lxpz·Nov 10, 2020

I was looking that up and found that in UNIX v6 source code, the field name in kernel source code is u_cdir, which stands for "current directory of (user) process": https://github.com/yisooan/unix-v6/blob/master/sys/user.h

In The myriad meanings of pwd in Unix systems

caf·Dec 29, 2018

...but I cannot find a source for that claim. You can see here that in UNIX v6 that /bin/ls had to implement its own readdir() function that calls fopen() on the directory and then getc() 16 times to read each 16-byte dirent: https://github.com/yisooan/unix-v6/blob/2c7099ee501923775c4c... You can also see that in those days, struct dirent contained only the inode and dname.

In Windows file access performance compared to Linux