SHIFT - delete an argument from the argument list.
- $*$SHift expression
- evaluates the given expression to obtain an integer value "n",
then deletes argument "n" from the EXEC command line argument list.
For example,
$*$shift 4-1
deletes argument 3.
All the remaining arguments "shift" to close the gap --
old argument 4 becomes new argument 3, old argument 5
becomes new argument 4, and so on.
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