sno(1)                                                     sno(1)



     NAME
          sno - SNOBOL interpreter

     SYNOPSIS
          sno [files]

     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
             effect:

                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 (non-unique) 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 parameters.
             Examples:

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

             All labels except define (even end) must have a non-empty
             statement.

             Labels, functions and variables must all have distinct
             names.  In particular, the non-empty statement on end
             cannot 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.



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     sno(1)                                                     sno(1)



             Parentheses for arithmetic are not needed.  Normal
             precedence applies.  Because of this, the arithmetic
             operators / and * must be set off by spaces.

             The right side of assignments must be non-empty.

             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.






































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