Re: [ast-users] Switching defaults for AST sum(1) via env variable?

Mon, 16 Apr 2012 00:46:32 -0700 

see (ast) getconf --man
in particular
  -w, --writable  Display the named writable variables in name=value form.
                  If name is omitted then all writable variables are listed.
and the ENVIRONMENT section for process and descendant local values via 
_AST_FEATURES

it is preferable to change the writeable values via getconf(1)
but my default .profile has
        _AST_FEATURES="UNIVERSE = att PATH_RESOLVE - logical"
        export _AST_FEATURES
which works even if the login shell is not ksh (ast getconf(1) is a ksh builtin)

setting UNIVERSE may influence more than you want
e.g., it controls default echo(1) behavior
you have to check individual --man to see all of the affected utilities

On Mon, 16 Apr 2012 02:27:53 +0200 Henk Langeveld wrote:
> ольга крыжановская:
> > Henk, can I control getconf UNIVERSE from an environment variable?

> I don't think so. getconf(1) is a cli built on top of the astgetconf(3)
> interface that in turn wraps the pathconf(2) and sysinfo(2) system calls.

> Some getconf variables may be changed for the current process and its
> descendants:

> HQ:/home/Henk 526 # getconf UNIVERSE
> att
> HQ:/home/Henk 527 # getconf UNIVERSE = bsd
> HQ:/home/Henk 528 # getconf UNIVERSE
> bsd
> HQ:/home/Henk 529 # echo abc | sum
> 8288 1
> HQ:/home/Henk 530 # getconf UNIVERSE = att
> HQ:/home/Henk 531 # echo abc | sum
> 304 1
> HQ:/home/Henk 532 #

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