sno(1)                                                     sno(1)



     NAME
          sno - SNOBOL interpreter

     SYNOPSIS
          sno [file...]

     DESCRIPTION
          sno is a SNOBOL compiler and interpreter (with slight
          differences).  sno obtains input from the concatenation of
          the named files and the standard input.  All input through a
          statement containing the label end is considered program and
          is compiled.  The rest is available to syspit.

          sno differs from SNOBOL in the following ways:

             There are no unanchored searches.  To get the same ef-
             fect:

                a**b            unanchored search for b.

                a*x*b=xc        unanchored assignment

             There is no back referencing.

                x=abc

                a*x*x           is an unanchored search for abc.

             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.  Func-
             tions cannot be defined at run time, and the use of the
             name define is preempted.  There is no provision for au-
             tomatic variables other than parameters.  Examples:

                define f( )
                define f(a, b, c)

             All labels except define (even end) must have a nonempty
             statement.

             Labels, functions and variables must all have distinct
             names.  In particular, the nonempty statement on end can-
             not merely name a label.

             If start is a label in the program, program execution
             will start there.  If not, execution begins with the
             first executable statement; define is not an executable
             statement.

             There are no built-in functions.




     April, 1990                                                     1

     sno(1)                                                     sno(1)



             Parentheses for arithmetic are not needed.  Normal pre-
             cedence applies.  Because of this, the arithmetic opera-
             tors / and * must be set off by spaces.

             The right side of assignments must be nonempty.

             Either ' or " may be used for literal quotes.

             The pseudo-variable sysppt is not available.

     FILES
          /usr/bin/sno

     SEE ALSO
          awk(1).
          SNOBOL, a String Manipulation Language, by D. J. Farber, R.
          E. Griswold, and I. P. Polonsky, JACM 11 (1964), pp. 21-30.






































     2                                                     April, 1990