XPost: comp.os.linux.misc   
   From: cfajohnson@gmail.com   
      
   On 2007-12-02, Michael Mauch wrote:   
   > Mark Hobley wrote:   
   >   
   >> I am looking at a script written for the runscript shell. I have a line as   
   >> follows:   
   >>   
   >> if [[ ${RC_INTERACTIVE:-yes} == "yes" ]] ; then   
   >>   
   >> I would like to know what the :- (colon minus) operator that follows the   
   >> variable name does.   
   >   
   > Like in a normal (POSIX like) shell   
      
      It is true for all 'Bourne-esque' shells.   
      
   > - "info bash" says:   
   >   
   >   ${PARAMETER:-WORD}'   
   >      If PARAMETER is unset or null, the expansion of WORD is   
   >      substituted.  Otherwise, the value of PARAMETER is substituted.   
      
      
   --   
      Chris F.A. Johnson, author   |       
      Shell Scripting Recipes:     |  My code in this post, if any,   
      A Problem-Solution Approach  |         is released under the   
      2005, Apress                 |    GNU General Public Licence   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)