XPost: comp.os.linux.misc   
   From: michael.mauch@gmx.de   
      
   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 - "info bash" says:   
      
     ${PARAMETER:-WORD}'   
        If PARAMETER is unset or null, the expansion of WORD is   
        substituted.  Otherwise, the value of PARAMETER is substituted.   
      
   Regards...   
                   Michael   
      
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