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Linux 2.6 - man page for script (linux section 5)

script(5)				      Files					script(5)

       script - Boot script

       The  boot  script describes how the Erlang runtime system is started. It contains instruc-
       tions on which code to load and which processes and applications to start.

       The command erl -boot Name starts the system with a boot file called Name.boot , which  is
       generated from the Name.script file, using systools:script2boot/1 .

       The .script file is generated by systools from a .rel file and .app files.

       The boot script is stored in a file with the extension .script

       The file has the following syntax:

       {script, {Name, Vsn},
	 {progress, loading},
	 {preLoaded, [Mod1, Mod2, ...]},
	 {path, [Dir1,"$ROOT/Dir",...]}.
	 {primLoad, [Mod1, Mod2, ...]},
	 {progress, loaded},
	 {kernelProcess, Name, {Mod, Func, Args}},
	 {apply, {Mod, Func, Args}},
	 {progress, started}]}.

	 * Name = string() defines the name of the system.

	 * Vsn = string() defines the version of the system.

	 * {progress,  Term}  sets  the  "progress"  of  the initialization program. The function
	   init:get_status() returns the current value of the progress,  which	is  {InternalSta-
	   tus,Term} .

	 * {path, [Dir]} where Dir is a string. This argument sets the load path of the system to
	   [Dir] . The load path used to load modules is obtained from	the  initial  load  path,
	   which is given in the script file, together with any path flags which were supplied in
	   the command line arguments. The command line arguments modify the path as follows:

	   * -pa Dir1 Dir2 ... DirN adds the directories Dir1, Dir2, ..., DirN to  the	front  of
	     the initial load path.

	   * -pz  Dir1 Dir2 ... DirN adds the directories Dir1, Dir2, ..., DirN to the end of the
	     initial load path.

	   * -path Dir1 Dir2 ... DirN defines a set of directories Dir1, Dir2,	...,  DirN  which
	     replaces  the  search path given in the script file. Directory names in the path are
	     interpreted as follows:

	     * Directory names starting with / are assumed to be absolute path names.

	     * Directory names not starting with / are assumed to be relative the current working

	     * The  special  $ROOT variable can only be used in the script, not as a command line
	       argument. The given directory is relative the Erlang installation directory.

	 * {primLoad, [Mod]} loads the modules [Mod] from the directories specified in Path . The
	   script   interpreter   fetches   the   appropriate  module  by  calling  the  function
	   erl_prim_loader:get_file(Mod) . A fatal error which terminates the system  will  occur
	   if the module cannot be located.

	 * {kernel_load_completed}  indicates  that  all  modules which must be loaded before any
	   processes are started are loaded. In interactive mode, all  {primLoad,[Mod]}  commands
	   interpreted after this command are ignored, and these modules are loaded on demand. In
	   embedded mode, kernel_load_completed is ignored, and all  modules  are  loaded  during
	   system start.

	 * {kernelProcess, Name, {Mod, Func, Args}} starts a "kernel process". The kernel process
	   Name is started by evaluating apply(Mod, Func, Args) which is expected to return  {ok,
	   Pid}  or  ignore  .	The init process monitors the behaviour of Pid and terminates the
	   system if Pid dies. Kernel processes are key components of the runtime  system.  Users
	   do not normally add new kernel processes.

	 * {apply,  {Mod, Func, Args}} . The init process simply evaluates apply(Mod, Func, Args)
	   . The system terminates if this results in an error. The boot procedure hangs if  this
	   function never returns.

       In  the interactive system the code loader provides demand driven code loading, but in the
       embedded system the code loader loads all the code immediately. The same version  of  code
       is  used  in  both  cases. The code server calls init:get_argument(mode) to find out if it
       should run in demand mode, or non-demand driven mode.


Ericsson AB				   sasl 				script(5)

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