The || operator

You can use the || operator to execute a command and, if it fails, execute the next command in the command list. For example:

   cmd1 || cmd2

cmd1 is executed and its exit status examined. If cmd1fails then cmd2 is executed. This is a terse notation for:

   cmd1
   if 	test $? -ne 0
   then
     cmd2 
   fi

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