Synopsis:
   assign [[-]<variable name> [<value>]]

Description:
   ASSIGN is the general-purpose interface for creating and manipulating
   variables.  Just about any value can be assigned, whether it be a
   string or a number.  Internally, TekNap treats the contents of all
   variables as strings, though it is smart enough to distinguish between
   strings and numerical values for mathematical purposes.

   The rules for variable names are similar to those of the C language;
   they may consist of any letter, digit, or the underscore (_) character,
   and they must begin with a letter.  Unlike C, variable names are not
   case-sensitive (nor are their contents, though they are case-preserving).

   ASSIGN is primarily used for string assignments.  It can be used for
   mathematical purposes as well, using the ${} construct, but it can very
   quickly become awkward and cumbersome.  Mathematical operations are
   better suited to the @ modifier (see Expressions).

Examples:
   To assign a text string to the variable $foo:
      assign foo this is some text string

   To compute the sum of two integers:
      assign foo ${4 + 5}

   To delete a variable:
      assign -foo

See Also:
   Expressions(7); Special_Vars(7); alias(5); eval(5); set(4) input_aliases

Other Notes:
   The default behavior of the client is to not treat variables specially
   on the command line; they are passed as literal text.  Variables normally
   are only expanded when used inside an alias.  This naturally poses a
   problem for using ASSIGN with the ${} construct from the input line.  To
   force $ expansion on the input line, set INPUT_ALIASES to on, or use EVAL.
   This is not a bug, it is a general feature of all commands.

