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elk - Online in the Cloud

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This is the command elk that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



elk, scheme-elk - extensible Scheme interpreter


elk [ -l file ] [ -h KBytes ] [ -p load-path ] [ -g ] [ -i ] [ -v type ] [[ -- ] args]



Elk (Extension Language Kit) is a Scheme implementation designed as a general extension
language for applications written in C or C++. Normally, Elk is linked with the
application it serves, but a stand-alone version of the Scheme interpreter is installed as
well (usually under the name elk). This interpreter, together with the standard Scheme
toplevel, Elk can be used as an ordinary, stand-alone implementation of the Scheme

When called without the -l option, Elk loads the standard “toplevel” to start an
interactive session. When called with -l file, the contents of the specified file is
loaded instead. If a `-' is given as a filename argument, Elk loads from standard input.

The option -p load-path can be used to override the standard load-path. The argument is a
colon-separated list of directories. If this option is not present and the environment
variable ELK_LOADPATH is defined, the value of this variable is used to initialize the
load-path. The value of ELK_LOADPATH has the same format as the argument to the -p

The -h KBytes option is used to specify a non-standard heap size. The default heap size
is 512 KBytes.

If the option -i is specified, symbols are mapped to lower case. Normally, Elk is case-

The -g option causes the interpreter to run the garbage collector each time memory is
allocated on the heap. This is useful for writers of extensions who want to test the
garbage collect behavior of an extension. Running Elk with the -g option is likely to
reveal GC-related bugs in extensions (such as not properly protected local objects), as it
triggers a garbage collection each time an object is allocated on the Scheme heap. A dot
is written to standard output each time a garbage collection is performed when -g has been

When called with one or more -v type (``verbose'') options, the interpreter prints
additional informational messages to standard output, depending on the value of the type
argument. If type is load, the linker command and options are printed each time an object
file is loaded; if type is init, the names of extension initialization and finalization
functions are printed as they are called.

The remaining args are put into a list of strings, and the Scheme variable command-line-
args is bound to this list in the global environment. If arguments could be interpreted
as options, `--´ can be used to indicate the end of the options.

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