[PATCH modular 03/13] build.sh: allow user to specify an alternate bin directory

[Alan Coopersmith]

On 12/29/10 07:21 PM, Trevor Woerner wrote:
> On Wed, Dec 29, 2010 at 9:58 PM, Gaetan Nadon <memsize at videotron.ca> wrote:
>> isn't it ${BINDIR:-$EPREFIX/bin} ?
> 
> These types of shell tests check whether or not the first value is
> unset or null, "omitting the colon results in a test only for a
> parameter that is unset". So what I'm saying is you can set BINDIR to
> "" and the script will still use that value (I'll let you choose to
> have a blank BINDIR). Maybe that doesn't make sense?
> 
> CAVEAT: we should probably check with the Solaris guys to verify this
> works in their shell? But I'm assuming it will because the other
> variables are using something similar.

Yes, from the Solaris 10 man page for the historic Bourne shell (which
you should be able to see on docs.sun.com):

     ${parameter:-word}      If parameter is set and is non-null,
                             substitute its value; otherwise sub-
                             stitute word.

     ${parameter:=word}      If parameter is not set or  is  null
                             set  it  to  word;  the value of the
                             parameter is substituted. Positional
                             parameters  may  not  be assigned in
                             this way.

     ${parameter:?word}      If parameter is set and is non-null,
                             substitute   its  value;  otherwise,
                             print word and exit from the  shell.
                             If  word  is  omitted,  the  message
                             "parameter  null  or  not  set"   is
                             printed.

     ${parameter:+word}      If parameter is set and is non-null,
                             substitute  word;  otherwise substi-
                             tute nothing.

     In the above, word is not evaluated unless it is to be  used
     as  the  substituted string, so that, in the following exam-
     ple, pwd is executed only if d is not set or is null:

     echo  ${d:-`pwd`}

     If the colon (:) is omitted from the above expressions,  the
     shell only checks whether parameter is set or not.

-- 
	-Alan Coopersmith-        alan.coopersmith at oracle.com
	 Oracle Solaris Platform Engineering: X Window System