When script is given, gosh loads the script, evaluating Scheme code in it. Then, if the script defines a procedure named main, gosh calls it with a single argument which is a list of the script name and subsequent arguments. When main returns an integer value, gosh exits with it as an exit code. If main returns non-integer value, or an error is signaled during evaluation, gosh exits with exit code 70 (EX_SOFTWARE). See SRFI-22 (http://srfi.schemers.org/srfi-22/srfi-22.html) for details. If there's no main procedure defined in the script, gosh exits with code 0 after loading the script file.

If no script file is given, gosh goes into an interactive mode. By default, gosh prompts the user to enter a Scheme expression, read and evaluates it, then prints the result, until EOF is read. If the standard input is not a terminal, however, gosh doesn't print a prompt; it allows a user to use gosh as a filter program. This behavior can be controlled by -i or -b option; see below.

The options -I, -A, -u, -l, -e and -E are processed in the order of appearance. For example, adding a load path by -I option affects the -l options after it, but not the ones before it.

-V

Prints gosh version and exits.

-b

Batch mode. Doesn't print prompt even the standard input is a terminal. Supersedes -i.

-i

Interactive mode. Forces to print prompt, even the standard input is not a terminal.

-q

Prevents reading the default initialization file.

-Ipath

Adds path in front of the load path list.

-Apath

Appends path to the tail of the load path list.

-umodule

Loads and imports module, as if "(use module )" is specified in the code.

-lfile

Loads a Scheme file file.

-eexpr

Evaluates a Scheme expression expr.

-Eexpr

Same as -e, except that the expr is read as if it is surrounded by parenthesis.

-fflag

Sets various flags. no-inline don't inline primitive procedures no-source-info don't preserve source information for debug load-verbose report while loading files case-fold uses case-insensitive reader (as in R5RS)

--

Specifies that there are no more options. If there are more arguments after this, they are taken as script file name and its arguments.

GAUCHE_LOAD_PATH

A colon separated list of the load paths. The paths are appended before the system default load paths.

GAUCHE_DYNLOAD_PATH

A colon separated list of the load paths for dynamically loaded objects. The paths are appended before the system default load paths.

Gauche Scheme interpreter: http://practical-scheme.net/gauche/

For the information about Scheme language, see http://www.schemers.org/