[vcf-midatlantic] Inventor of Unix Chroot?

william degnan billdegnan at gmail.com
Tue Sep 19 08:38:04 EDT 2017

>From the below chroot was not actually invented it was an alias of chdir.
The inventing had already happened with whomever it was that evolved the
chdir command's security features for FTP etc.  chdir was already doing the
chroot stuff on the p d p 11 and vax unix.


Bill Degnan
twitter: billdeg
On Sep 19, 2017 2:29 AM, "Evan Koblentz via vcf-midatlantic" <
vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:

> Help me with a research thingamajig.
> I want to find out who made Chroot.
> Wikipedia -- purely as a starting point -- shows a comment in the Chroot
> talk page stating, "This system call was present [in] AT&T versions of Unix
> well before 1982. This citation should be changed to point to an AT&T
> version. Indeed, Research's UNIX V7 sources (usr/sys/sys/sysent.c dated May
> 7th, 1979) has an entry at position 61 for chroot(2); the fact is even
> noted under the article about V7..."
> See: https://en.wikipedia.org/wiki/Talk%3AChroot#Bill_Joy_did_not
> _invent_chroot
> I know many of you are old-school Unix users/developers and some of you
> worked at AT&T.
> Who can help me find out which specific people (I need names) actually
> invented Chroot?
> ________________________________
> Evan Koblentz, director
> Vintage Computer Federation
> a 501(c)(3) educational non-profit
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