[TUHS] /bin/true (was basic tools / Universal Unix)

Chet Ramey chet.ramey at case.edu
Fri Oct 20 22:10:03 AEST 2017


On 10/19/17 7:00 PM, Dave Horsfall wrote:
> On Thu, 19 Oct 2017, Chet Ramey wrote:
> 
>> Yes, Posix requires that all builtins be execable. It doesn't require
>> true and false to be implemented as builtins, though.
> 
> Good luck with "cd"...

It doesn't have to do what you think it should. Using `cd' with something
like `find' or `env' is a fine way to test directory accessibility. The
Posix standard contains several examples of such use.

http://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xcu_chap01.html#tag_23_01_07
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
		 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet at case.edu    http://cnswww.cns.cwru.edu/~chet/


More information about the TUHS mailing list