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The shift (Section 35.22) command "shifts away" one command-line parameter. You can shift three times if there are three command-line parameters. Many shells also can take an argument, like shift 3, that tells how many times to shift; on those shells, you can shift $# (Section 35.20) to unset all parameters.
The portable way to unset all command-line parameters is probably to set (Section 35.25) a single dummy parameter, then shift it away:
+set x shift
Setting the single parameter wipes out whatever other parameters were set before.
-- JP
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| 36.9. Finding the Last Command-Line Argument |  | 36.11. Standard Input to a for Loop |
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