Date: Wed, 1 Feb 2017 14:59:29 -0500 From: "James B. Byrne" <byrnejb@harte-lyne.ca> To: "Polytropon" <freebsd@edvax.de> Cc: freebsd-questions@freebsd.org Subject: Re: Variable assignment in sh Message-ID: <84861d4906923faec222f96580833c2f.squirrel@webmail.harte-lyne.ca> In-Reply-To: <20170131200143.00c5e5da.freebsd@edvax.de> References: <b831bd9e40321e59910ea8913c7a6302.squirrel@webmail.harte-lyne.ca> <20170131161824.a9f1ef46.freebsd@edvax.de> <b553c644fccc211f9658b31cfe65e8a0.squirrel@webmail.harte-lyne.ca> <20170131185103.7f911dfb.freebsd@edvax.de> <5f51e2c3bdb8a20c6a7786c2b345c957.squirrel@webmail.harte-lyne.ca> <20170131200143.00c5e5da.freebsd@edvax.de>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, January 31, 2017 14:01, Polytropon wrote:
> On Tue, 31 Jan 2017 12:56:40 -0500, James B. Byrne wrote:
>> How would bash become unavailable on this particular system without
>> someone specifically removing it?
>
> A rare occassion, but possible. Let's say in a worst-case scenario,
> /usr isn't mounted, and you need to stick with what's on /, then
> bash, which per default is /usr/local/bin/bash, isn't available.
> However, bash can be linked statically _and_ copied to a location
> on /, then you won't have that kind of problem.
>
> Portability also could be a problem when you try to run something
> that expects bash on a system where bash isn't installed. Always
> keep in mind that bash is _not_ part of FreeBSD, while sh is.
Yes, I will do that from here on.
>
> I know, those are very special cases, and if your goal is not
> portability and "guaranteed availability", then it won't hit you.
> I just thought it's worth being mentioned.
Thank you. I have found your explanation of what goes on under the
covers very interesting. In this case I am dealing with a zfs system
so if /usr is not there then neither is /bin.
--
*** e-Mail is NOT a SECURE channel ***
Do NOT transmit sensitive data via e-Mail
Do NOT open attachments nor follow links sent by e-Mail
James B. Byrne mailto:ByrneJB@Harte-Lyne.ca
Harte & Lyne Limited http://www.harte-lyne.ca
9 Brockley Drive vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada L8E 3C3
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?84861d4906923faec222f96580833c2f.squirrel>