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Date:      Tue, 31 Jan 2017 17:27:19 +0000
From:      Matthew Seaman <matthew@FreeBSD.org>
To:        freebsd-questions@freebsd.org
Subject:   Re: Variable assignment in sh
Message-ID:  <55ebe089-8e89-cad3-dbb7-55b9918e8cca@FreeBSD.org>
In-Reply-To: <b553c644fccc211f9658b31cfe65e8a0.squirrel@webmail.harte-lyne.ca>
References:  <b831bd9e40321e59910ea8913c7a6302.squirrel@webmail.harte-lyne.ca> <20170131161824.a9f1ef46.freebsd@edvax.de> <b553c644fccc211f9658b31cfe65e8a0.squirrel@webmail.harte-lyne.ca>

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From: Matthew Seaman <matthew@FreeBSD.org>
To: freebsd-questions@freebsd.org
Message-ID: <55ebe089-8e89-cad3-dbb7-55b9918e8cca@FreeBSD.org>
Subject: Re: Variable assignment in sh
References: <b831bd9e40321e59910ea8913c7a6302.squirrel@webmail.harte-lyne.ca>
 <20170131161824.a9f1ef46.freebsd@edvax.de>
 <b553c644fccc211f9658b31cfe65e8a0.squirrel@webmail.harte-lyne.ca>
In-Reply-To: <b553c644fccc211f9658b31cfe65e8a0.squirrel@webmail.harte-lyne.ca>

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On 2017/01/31 17:11, James B. Byrne via freebsd-questions wrote:
>> a shell script (FreeBSD's default scripting shell)

> What does this mean exactly?  Is not CSH a shell?  I thought that the
> shell used in cron was the shell of the user associated with the
> crontab file?  What is cron's default shell otherwise?

He's making a distinction between a shell for interactive use -- which
defaults to tcsh or csh in the FreeBSD base system -- and a shell used
for programming shell scripts -- which defaults to /bin/sh.

Of course, either shell can be used in either role, but writing scripts
in csh is a bit painful, and /bin/sh doesn't have all the nice
bells'n'whistles for interactive use.

The default shell used for cron jobs is /bin/sh, irrespective of the
login shell of the user who owns the crontab.  You can override this
from within the crontab by adding eg.

SHELL=3D/bin/tcsh

and, of course, you can just specify the appropriate shell on the
command line inside crontab or by setting a #! line at the top of any
executable scripts.

	Cheers,

	Matthew



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