sno

PURPOSE

     Provides a SNOBOL interpreter.

SYNOPSIS
     sno [ files ]


DESCRIPTION

     The  sno command  provides a  SNOBOL compiler  and inter-
     preter, with  some differences from standard  SNOBOL.  It
     reads the  named files and  the standard input.   It com-
     piles all input through  a statement containing the label
     end.  The rest  is available to syspit.   The sno command
     differs from SNOBOL in the following ways:

     o   There are  no unanchored  searches.  To get  the same
         effect:
         a  **  b            Unanchored search for b
         a  *x*  b  =  x  c  Unanchored assignment.
     o   There is no back referencing.
         x  =  "abc"
         a  *x*  x           Unanchored search for abc.
     o   Function declaration  is done at compile  time by the
         use of the (nonunique)  label define.  Execution of a
         function call  begins at the statement  following the
         define.  Functions cannot be defined at run time, and
         the use of the name define is preempted.  There is no
         provision for automatic  variables other than parame-
         ters.  Examples:
             define f()
             define f(a, b, c)
     o   All labels except define (even end), must have a non-
         empty statement.
     o   Labels, functions,  and variables must all  have dis-
         tinct names.   In particular, the  nonempty statement
         on end cannot merely name a label.
     o   If start is a label in the program, program execution
         begins  there.  If  not,  execution  begins with  the
         first executable statement. define  is not an execut-
         able statement.
     o   There are no built-in functions.
     o   Parentheses  for arithmetic  are not  needed.  Normal
         precedence applies.  Because  of this, the arithmetic
         operators \ (backslash) and  * (asterisk) must be set
         off by spaces.
     o   The right side of assignments must be nonempty.
     o   Either ' (single quotation  mark) or " (double quota-
         tion mark) can be used for literal quotation marks.
     o   The pseudo-variable sysppt is not available.

RELATED INFORMATION

     The following command:  "awk."