This saga example implements as imple shell, which can,
accoriding to the SAGA philosophy, be used in a variety 
of environments.

The following commands are available:

  // namespace related
  # pwd
  # cd            <dir>
  # ls
  # cp            <source> <target>
  # mv            <source> <target>
  # rm            <file>
  # ln            <source> <target>
  # mkdir         <dir>
  # rmdir         <dir>

  // file related
  # cat           <file>

  // logical file related
  # log_find      <pat> [<key=val> ...]
  # log_list
  # log_add       <logical file> <url>
  # log_remove    <logical file> <url>
  # log_update    <logical file> <old> <new>
  # log_replicate <logical file> <target>

  // job related
  # run           <exe>
  # ps
  # suspend       <job>
  # resume        <job>
  # kill          <job>
  # status        <job>

  // shell internals
  # set           <key> <val>
  # help
  # exit

The initial values for starting directory and default job
manager are set as environment variable.  Below are the default:

  setenv SAGA_SHELL_ROOT     file://localhost//tmp
  setenv SAGA_SHELL_CONTACT  fork://localhost/

The file env_local.csh sets these defaults, the file
env_globus.csh shows an example of Globus settings.  Sourcing
these files before running the shell shows nicel that SAGA-A is
adaptive to the environment.