(bash.info) Positional Parameters

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 3.4.1 Positional Parameters
 ---------------------------
 
 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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