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(guile.info)Runtime Environment

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Runtime Environment
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 - primitive: program-arguments
 - procedure: command-line
     Return the list of command line arguments passed to Guile, as a
     list of strings.  The list includes the invoked program name,
     which is usually `"guile"', but excludes switches and parameters
     for command line options like `-e' and `-l'.

 - primitive: getenv nam
     Looks up the string NAME in the current environment.  The return
     value is `#f' unless a string of the form `NAME=VALUE' is found,
     in which case the string `VALUE' is returned.

 - procedure: setenv name value
     Modifies the environment of the current process, which is also the
     default environment inherited by child processes.

     If VALUE is `#f', then NAME is removed from the environment.
     Otherwise, the string NAME=VALUE is added to the environment,
     replacing any existing string with name matching NAME.

     The return value is unspecified.

 - primitive: environ [env]
     If ENV is omitted, returns the current environment as a list of
     strings.  Otherwise it sets the current environment, which is also
     the default environment for child processes, to the supplied list
     of strings.  Each member of ENV should be of the form `NAME=VALUE'
     and values of `NAME' should not be duplicated.  If ENV is supplied
     then the return value is unspecified.

 - primitive: putenv str
     Modifies the environment of the current process, which is also the
     default environment inherited by child processes.

     If STRING is of the form `NAME=VALUE' then it will be written
     directly into the environment, replacing any existing environment
     string with name matching `NAME'.  If STRING does not contain an
     equal sign, then any existing string with name matching STRING will
     be removed.

     The return value is unspecified.