[TUHS] PDP-7 UNIX filesystem

Lars Brinkhoff lars at nocrew.org
Wed Oct 23 15:48:04 AEST 2019

Does anyone have any input for Angelo?  I think the questions he asks
are interesting.  Please note he's asking about PDP-7 Unix, not the
unrelated "dd" command and how "." and ".." work in later Unix versions.

Angelo Papenhoff wrote:
> you cannot execute a program if you're in a directory you can't write into.
> 	I asked Warren about this when I first tried pdp7 unix and he
> explained it to me: the shell creates a link to the binary and executes
> it. If it can't write into the current directory, it fails to create the
> link and hence can't execute the program.
> 	How was this handled in practice? did users have write
> permissions on all directories? did you just stay in your directory all
> the time?

> . and ..

This part is apparently resolved.

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