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(bashref.info)Positional Parameters

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Positional Parameters
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   A POSITIONAL PARAMETER is a parameter denoted by one or more digits,
other than the single digit `0'.  Positional parameters are assigned
from the shell's arguments when it is invoked, and may be reassigned
using the `set' builtin command.  Positional parameter `N' may be
referenced as `${N}', or as `$N' when `N' consists of a single digit.
Positional parameters may not be assigned to with assignment statements.
The `set' and `shift' builtins are used to set and unset them (Note:
Shell Builtin Commands).  The positional parameters are temporarily
replaced when a shell function is executed (Note: Shell Functions).

   When a positional parameter consisting of more than a single digit
is expanded, it must be enclosed in braces.