CommandInterpreters < U-Bootdoc

%SECTION0{NAME=CommandInterpreters}%  Command Interpreters
 
Two command line interfaces:

   * Simple (old) command interpreter:
      * sequential statements
      * statements separated by newline or ';'
      * no conditional execution except simple builtin rules:
         * ="run cmd1; run cmd2; run cmd3"= <br>
           will always run all three commands
         * ="run cmd1 cmd2 cmd3"= <br>
           will stop when a command fails
      * "scripts" (canned sequences of commands) avaialble using ="autoscr"= command
        <br><br>
   * Hush Shell (from Busybox, see http://www.busybox.net/):
      * Bourne Shell compatible
      * (local) shell variables (="name=val"=), (global) environment variables (="setenv name val"=)
      * Conditionals: ="if ... then ... else ... fi"=
      * Control loops: ="for ... do ... done"=, ="while ... do done"=, ="until ... do ... done"=
      * Control operators: =&&= and =||= (=AND= and =OR= lists: ="command1 && command2"=)
      * real shell scripts
         <br><br>
      * no functions
      * no command substitution
      * no backquotes
1.9. Boot Options		1. Abstract		1.11. Standalone Programs
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