sno(1)                     DG/UX 4.30                      sno(1)



     NAME
          sno - SNOBOL interpreter and compiler

     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 = x c 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.

               Parentheses for arithmetic are not needed.  Normal



     Licensed material--property of copyright holder(s)         Page 1

     sno(1)                     DG/UX 4.30                      sno(1)



               precedence applies.  Because of this, the arithmetic
               operators / and * must be set off by spaces.

               The right side of assignments must not be empty.

               Either ' or " may be used for literal quotes.

               The pseudo-variable sysppt is not available.

     SEE ALSO
          awk(1).












































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