On 1-11-2012 11:09, Uwe Koloska wrote:
Hello,
Am 31.10.2012 00:21, schrieb Hans Hagen:
This assumes control over the login shell as well as control over what
the launchers of system processes use. I must admit that till now I
always assumed some stability in this, which is probably okay as long
as one sticks to one specific distribution (of linux).
There is stability in that /bin/sh always must be a (posix compatible)
bourne (not again) style shell!
I think that the main problem is that #! /bin/sh can mean anything
(although in your case I suppose you expect it to be the bourne shell).
A shell available as /bin/sh can have far more features but you can not
rely on them!
So the question is, should the scripts that come with context (like
the installer) be explicit and become #! /bin/bash ?
If the scripts do use bashisms they have to be declared with #!
/bin/bash. So you do have this options:
* rewrite the scripts to be truly posix and use #! /bin/sh (the dash
links from another mail may help)
* leave the scripts alone with all their bashisms and declare them with
#! /bin/bash
My advice on this is: in all shellscripts you write, declare the shell
that you are testing the script with -- so on most linux systems (and in
windows unix environments like msys) use /bin/bash and only change this
to /bin/sh if you have to. For example to make it compatible to a
minimal system (a jeos VM comes to mind) that is not supposed to provide
/bin/bash.
add to this: don't use google cq. and don't look into other scripts to
get an idea on what to do but buy a book on scripting
(thinking of it: i might as well stick to lua scripts)
Hans
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Hans Hagen | PRAGMA ADE
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