(bash.info) Positional Parameters
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3.4.1 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 (
Shell Builtin Commands). The positional parameters are temporarily
replaced when a shell function is executed ( Shell Functions).
When a positional parameter consisting of more than a single digit
is expanded, it must be enclosed in braces.
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