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"
will always run all three commands
-
"run cmd1 cmd2 cmd3"
will stop when a command fails
- "scripts" (canned sequences of commands) avaialble using
"autoscr" command
- 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
- no functions
- no command substitution
- no backquotes
