Variable overriding

A local variable can be given a value for the duration of one command by prefixing the command with the variable assignment. For example:

   var=2
   var=1 for_info 'var=' $var
   for_info 'var=' $var

If the command is a function call, then the new value applies for the duration of the function call, after which the variable reverts to its previous value. It makes no difference whether or not the function also alters the value.