Setting Env

[Garrett Cooper]

Drew Jenkins wrote:
>>> ----- Original Message ----
>>> From: Jerry McAllister <jerrymc at msu.edu>
>>> To: Drew Jenkins <drewjenkinsjr at yahoo.com>
>>> Cc: freebsd-questions at freebsd.org
>>> Sent: Tuesday, March 6, 2007 7:46:26 PM
>>> Subject: Re: Setting Env
>>>
>>>> If you want the environment variable to
>>>> be set for something that is taking place in the script, then
>>>> that variable must either be set in a durable way in the parent
>>>> environment or be set right there in the script that is using it.
>>>> The rc.conf method will make it available from the parent.
>>>> That is the whole point of rc.conf.
>>> Right. I figured that much. So, what do I actually put in that file? I
>>> tried these two options:
>>>
>>> setenv LD_LIBRARY_PATH /usr/local/lib/mysql/
>>>
>>> export LD_LIBRARY_PATH="/usr/local/lib/mysql/"
>>>
>> Well, setenv is a csh or tcsh command and isn't in sh and probably
>> not in bash either (I haven't used bash).
>>
> 
> I am aware of that. I was trying to explain how I used every_possible_combination of things I could think of!
> 
>> The export command is an sh and probably bash command and it
>> doesn't exist in csh or tcsh.
>>
> 
> Yes, yes. I know.
> 
>>> It didn't like either, presumably because it's not calling a bash or c-shell.
>>> So, what should I put in /etc/rc.conf that will achieve my objective?
>> Look at other variable setting in rc.conf.  That should give you
>> a good clue.   For example, in my rc.conf I have several.  One is:
>>  moused_enable="YES"
>> That makes the moused_enable variable have a value of YES.
>> So, if you want LD_LIBRARY_PATH to have the value of /usr/local/lib/mysql/
>> might that not be:
>>  LD_LIBRARY_PATH="/usr/local/lib/mysql/"
>>
> 
> I tried that and posted yesterday that that failed.
> 
>> If you put it in the script that starts things - there needs to be one -
>> then it depends on the script language, csh/tcsh sh/bash.
>> csh/tcsh use setenv and set
>> sh [and bash] use set  and variable_name=value and needs an export to
>> make it available to other entities besides the shell itself.
>> You should look up the man pages on these things and take a look
>> at some other scripts such as those in /usr/local/etc/rc.d for
>> examples.
> 
> What *things*? As far as scripts, this *should* be easy...
> 
> #!/bin/csh
> setenv LD_LIBRARY_PATH /usr/local/lib/mysql/
> 
> ...right? It doesn't work. Any other ideas?
> Drew

It probably gets overwritten somewhere later on down the line.

Also, something to the effect like the following is better for 
portability reasons:

#!/bin/sh

if [ -n "$LD_LIBRARY_PATH" ] ; then
	export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:/usr/local/lib/mysql"
else
	export LD_LIBRARY_PATH="/usr/local/lib/mysql"
fi

# run mysql junk here..