sno(1)                                                     sno(1)



NAME
     sno - runs the SNOBOL interpreter

SYNOPSIS
     sno [file]...

ARGUMENTS
     file Specifies the file to be interpreted by the sno
          command.

DESCRIPTION
     sno is a SNOBOL compiler and interpreter (with slight
     differences).  The sno command 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.

     The sno command differs from SNOBOL in the following ways:

          There are no unanchored searches.  To get the same
          effect:

               a**b Performs unanchored search for b.

               a*x*b=xc
                    Specifies an unanchored assignment.

          There is no back referencing.

               x=abc
               a*x*x
                    Specifies 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.  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.  Here are a few 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
          cannot merely name a label.




January 1992                                                    1

sno(1)                                                     sno(1)



          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.

          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 nonempty.

          Either ' or " " " " " " may be used for literal quotes.

          The pseudo-variable sysppt is not available.

FILES
     /usr/bin/sno
          Executable file

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                                                    January 1992