Shells, features and interaction

[maurice at nmtvax.UUCP]

>>text	data	bss	dec	hex
>>27648	1024	2568	31240	7a08	/bin/sh		8th edition shell
>>67584	2048	5740	75372	1266c	/bin/csh	C shell
>>81920	3072	9224	94216	17008	/usr/lbin/ksh	Korn shell
>
>CSH doesn't have to be this big. It can be made to run on a small-number
>PDP-11 with only 64K bytes of process address space. Personally I think
>these shells could all do with some pruning... but then I'm a confirmed
>PDP-11 fan.

  You must be forgetting about overlays then. As it is right now, csh
*needs* the use of overlays (the 2.9bsd  version) to run. From doing
a check on it, a size yields this:

   text    data   bss    dec     octal
   16128 + 1240 + 1952 = 19320  45570
   56000 total text, overlays: (16384,15936,7552)

Looks like less than 64? You still need to put the stack in there as well,
and that gets the last 8k segment of 64k (depends on the pdp type, this
is from a nonseperate i/d pdp 23+).

It may be big to you (csh) , but I like the functionality it gives over sh.

   Roger M. Levasseur
   New Mexico Tech