USER - prompt user for input.

$*$USer expression :string

evaluates the given "expression" to obtain an integer "n". This should be between 1 and 99. EXEC then displays the given "string" as a prompt on the terminal. Finally, it reads a command line argument from the standard input and uses this input as argument "n" in the argument list. For example,

$*$user 3 :"Enter your name"

prompts the user with the given string, and treats the user's reply as argument 3 in the argument list. The "string" may be omitted, in which case EXEC just reads the standard input without prompting.