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SCM(Sep 2 1998) SCM(Sep 2 1998)
NAME
scm - a Scheme Language Interpreter
SYNOPSIS
scm [-a kbytes ] [-ibvqmu] [-p number ] [-c expression ]
[-e expression ] [-f filename ] [-l filename ] [-d file-
name ] [-r feature ] [-- | - | -s] [filename] [arguments
...]
DESCRIPTION
Scm is a Scheme interpreter.
Upon startup scm loads the file specified by by the envi-
ronment variable 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 occurs in the command
line, "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 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 heap-
size 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.
-eexpression
-cexpression
specifies that the scheme expression expression is to
be evaluated. These options are inspired by perl and
sh respectively. On Amiga systems the entire option
and argument need to be enclosed in qoutes. For
instance "-e(newline)".
-rfeature
requires feature. This will load a file from SLIB if
that feature is not already supported. If feature is
1
SCM(Sep 2 1998) SCM(Sep 2 1998)
2, 3, 4, or 5 scm will require the features necces-
sary to support R2RS, R3RS, R4RS, or R5RS, respec-
tively.
-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 preceeds it.
-dfilename
opens (read-only) the extended relational database
filename. If filename contains initialization code,
it will be run when the database is opened.
-plevel
sets the prolixity (verboseness) to level. This is
the same as the scm command (verobse 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 interactions 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 interactions will be without R4RS macro capabil-
ity. R4RS macro capability can be restored by a sub-
sequent -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
2
SCM(Sep 2 1998) SCM(Sep 2 1998)
are to be treated as program aguments.
- -- 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 initial-
ization 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 initialization 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 speci-
fied 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 spec-
ified 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 session.
% scm -e '(display (list-ref *argv* *optind*))' bar
Print ``bar''
% scm -rpretty-print -r format -i
Load pretty-print and format and enter interactive
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SCM(Sep 2 1998) SCM(Sep 2 1998)
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, logcount, integer-length, bit-extract, defmacro,
macroexpand, macroexpand1, 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 internal-time-units-per-second constants.
*Features* and *load-pathname* variables.
Arrays and bit-vectors. String ports and software emula-
tion ports. I/O extensions providing most of ANSI C and
POSIX.1 facilities.
User definable responses to interrupts and errors, Pro-
cess-syncronization primitives, String regular expression
matching, and the CURSES screen management package.
Available add-on packages including an interactive debug-
ger, database, X-window graphics, BGI graphics, Motif, and
Open-Windows packages.
A compiler (HOBBIT, available separately) and dynamic
linking of compiled modules.
Setable levels of monitoring and timing information
printed interactively (the `verbose' function). Restart,
quit, and exec.
FILES
scm.texi
Texinfo documentation of scm enhancements, internal
representations, and how to extend or include scm
4
SCM(Sep 2 1998) SCM(Sep 2 1998)
in other programs.
AUTHORS
Aubrey Jaffer (jaffer @ai.mit.edu)
Radey Shouman (Radey.Shouman @splashtech.com)
BUGS
SEE ALSO
The Scheme specifications for details on specific proce-
dures (swissnet.ai.mit.edu:archive/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
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