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SCM(April 2006)                                                SCM(April 2006)



NAME
       scm - a Scheme Language Interpreter

SYNOPSIS
       scm [-a kbytes ] [-muvqib] [--version] [--help]
       [[-]-no-init-file] [--no-symbol-case-fold]
       [-p int ] [-r feature ] [-h feature ]
       [-d filename ] [-f filename ] [-l filename ]
       [-c expression ] [-e expression ] [-o dumpname ]
       [-- | - | -s] [ filename ] [ arguments ...  ]

DESCRIPTION
       Scm is a Scheme interpreter.

       Upon  startup  scm loads the file specified by by the environment vari-
       able SCM_INIT_PATH or by the parameter IMPLINIT  in  the  makefile  (or
       scmfig.h)  if  SCM_INIT_PATH  is not defined.  The makefiles attempt to
       set IMPLINIT to "Init.scm" in the source directory.

       Unless the option -no-init-file or --no-init-file occurs in the command
       line  or  if scm is being invoked as a script, "Init.scm" checks to see
       if there is file "ScmInit.scm" in the path specified by the environment
       variable  HOME  (or in the current directory if HOME is undefined).  If
       it finds such a file, then it is loaded.

       "Init.scm" then looks for command input from one of three sources: From
       an  option  on the command line, from a file named on the command line,
       or from standard input.


OPTIONS
       The options are processed in the order specified on the command line.

       -akbytes
            specifies that scm should allocate an initial heapsize of  kbytes.
            This option, if present, must be the first on the command line.

       --no-init-file
            Inhibits the loading of "ScmInit.scm" as described above.

       --no-symbol-case-fold
            Symbol (and identifier) names are case-sensitive.

       -eexpression

       -cexpression
            specifies  that  the  scheme expression expression is to be evalu-
            ated.  These options are inspired by perl and sh respectively.  On
            Amiga  systems  the entire option and argument need to be enclosed
            in quotes.  For instance "-e(newline)".

       -rfeature
            requires feature.  This will load a file from SLIB if that feature
            is  not  already  supported.  If feature is 2, 3, 4, or 5 scm will
            require the features necessary to support  R2RS,  R3RS,  R4RS,  or
            R5RS, respectively.

       -hfeature
            provides feature.

       -lfilename

       -ffilename
            loads  filename.   Scm will load the first (unoptioned) file named
            on the command line if no -c, -e, -f, -l, or  -s  option  precedes
            it.

       -dfilename
            opens  (read-only)  the extended relational database filename.  If
            filename contains initialization code, it will  be  run  when  the
            database is opened.

       -odumpname
            saves  the current SCM session as the executable program dumpname.
            This option works only in SCM builds supporting dump.

            If options appear on the command line after -o dumpname, then  the
            saved  session will continue with processing those options when it
            is invoked.  Otherwise the (new)  command  line  is  processed  as
            usual when the saved image is invoked.

       -plevel
            sets  the  prolixity  (verboseness) to level.  This is the same as
            the scm command (verbose level ).

       -v   (verbose mode) specifies that scm will print  prompts,  evaluation
            times, notice of loading files, and garbage collection statistics.
            This is the same as -p3.

       -q   (quiet mode) specifies that scm will print no  extra  information.
            This is the same as -p0.

       -m   specifies  that  subsequent  loads, evaluations, and user interac-
            tions will be with R4RS macro capability.  To use a specific  R4RS
            macro  implementation from SLIB (instead of SLIB’s default) put -r
            macropackage before -m on the command line.

       -u   specifies that subsequent loads, evaluations,  and  user  interac-
            tions  will be without R4RS macro capability.  R4RS macro capabil-
            ity can be restored by a subsequent -m on the command line or from
            Scheme code.

       -i   specifies  that scm should run interactively.  That means that scm
            will not terminate until the (quit) or (exit)  command  is  given,
            even  if  there are errors.  It also sets the prolixity level to 2
            if it is less than 2.  This will print prompts, evaluation  times,
            and  notice  of  loading files.  The prolixity level can be set by
            subsequent options.  If scm is started from a tty, it will  assume
            that it should be interactive unless given a subsequent -b option.

       -b   specifies that scm should run non-interactively.  That means  that
            scm  will  terminate after processing the command line or if there
            are errors.

       -s   specifies, by analogy with sh, that  further  options  are  to  be
            treated as program arguments.

       -    -- specifies that there are no more options on the command line.

ENVIRONMENT VARIABLES
       SCM_INIT_PATH
            is  the  pathname where scm will look for its initialization code.
            The default is the file "Init.scm" in the source directory.

       SCHEME_LIBRARY_PATH
            is the SLIB Scheme library directory.

       HOME is the directory where "Init.scm" will look for the user  initial-
            ization file "ScmInit.scm".

SCHEME VARIABLES
       *argv*
            contains  the list of arguments to the program.  *argv* can change
            during argument processing.  This list is suitable for use  as  an
            argument to SLIB getopt.

       *R4RS-macro*
            controls  whether  loading  and  interaction  support R4RS macros.
            Define this in "ScmInit.scm" or files  specified  on  the  command
            line.  This can be overridden by subsequent -m and -u options.

       *interactive*
            controls  interactivity  as  explained  for the -i and -b options.
            Define this in "ScmInit.scm" or files  specified  on  the  command
            line.  This can be overridden by subsequent -i and -b options.

EXAMPLES
       % scm foo.scm arg1 arg2 arg3
            Load  and  execute  the contents of foo.scm.  Parameters arg1 arg2
            and arg3 are stored in the global list *argv*.

       % scm -f foo.scm arg1 arg2 arg3
            The same.

       % scm -s foo.scm arg1 arg2
            Set *argv* to ("foo.scm" "arg1" "arg2") and enter interactive ses-
            sion.

       % scm -e ’(display (list-ref *argv* *optind*))’ bar
            Print ‘‘bar’’

       % scm -rpretty-print -r format -i
            Load pretty-print and format and enter interactive mode.

       % scm -r5
            Load  dynamic-wind,  values, and R4RS macros and enter interactive
            (with macros) mode.

       % scm -r5 -r4
            Like above but rev4-optional-procedures are also loaded.

FEATURES
       Runs under Amiga, Atari-ST, MacOS, MS-DOS, OS/2, NOS/VE,  Unicos,  VMS,
       Unix and similar systems.  Support for ASCII and EBCDIC character sets.

       Conforms to Revised^5 Report on the Algorithmic Language Scheme and the
       IEEE P1178 specification.

       Support for SICP, R2RS, R3RS, and R4RS scheme code.

       Many  Common  Lisp  functions: logand, logor, logxor, lognot, ash, log-
       count, integer-length,  bit-extract,  defmacro,  macroexpand,  macroex-
       pand1,  gentemp, defvar, force-output, software-type, get-decoded-time,
       get-internal-run-time,  get-internal-real-time,  delete-file,   rename-
       file, copy-tree, acons, and eval.

       Char-code-limit, most-positive-fixnum, most-negative-fixnum, and inter-
       nal-time-units-per-second constants.   *Features*  and  *load-pathname*
       variables.

       Arrays  and  bit-vectors.   String  ports and software emulation ports.
       I/O extensions providing most of ANSI C and POSIX.1 facilities.

       User definable responses to interrupts and errors, Process-synchroniza-
       tion  primitives,  String  regular  expression matching, and the CURSES
       screen management package.

       Available add-on packages including an interactive debugger,  database,
       X-window graphics, BGI graphics, Motif, and Open-Windows packages.

       A  compiler  (HOBBIT, available separately) and dynamic linking of com-
       piled modules.

       Setable levels of monitoring and timing  information  printed  interac-
       tively (the ‘verbose’ function).  Restart, quit, and exec.

FILES
       scm.texi
              Texinfo  documentation of scm enhancements, internal representa-
              tions, and how to extend or include scm in other programs.

AUTHORS
       Aubrey Jaffer (jaffer @ alum.mit.edu)
       Radey Shouman (shouman @ ne.mediaone.net)

BUGS
SEE ALSO
       The SCM home-page:
       http://swissnet.ai.mit.edu/~jaffer/SCM.html

       The  Scheme  specifications  for   details   on   specific   procedures
       (http://swissnet.ai.mit.edu/ftpdir/scheme-reports/) or

       IEEE Std 1178-1990,
       IEEE Standard for the Scheme Programming Language,
       Institute of Electrical and Electronic Engineers, Inc.,
       New York, NY, 1991

       Brian Harvey and Matthew Wright
       Simply Scheme: Introducing Computer Science_
       MIT Press, 1994 ISBN 0-262-08226-8

       R. Kent Dybvig, The Scheme Programming Language,
       Prentice-Hall Inc, Englewood Cliffs, New Jersey 07632, USA

       H. Abelson, G. J. Sussman, and J. Sussman,
       Structure and Interpretation of Computer Programs,
       The MIT Press, Cambridge, Massachusetts, USA



4th Berkeley Distribution                                      SCM(April 2006)