Summary of UI Commands

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pwd
ls		[ < directory> ... ]
cd		[ <directory> ]
popd		[ <directory> ]
pushd		[ <directory> ]
more		[ <filename> ]
unix		[ <unix command string> ]

open		[ <ldl++ schema and/or rules filename> ... ]
load		[ <ldl++ schema and/or rules filename> ... ]
close
initdb		[ <ldl++ facts filename> ... ]
savedb		  <ldl++ database filename>
getdb		[ <ldl++ database filename> ]
releasedb
compile		[ <exported query form> ... ]
query		[ <predicate> ]
insert		[ <ground predicate> ]
delete		[ <predicate> ]
display		[ "schema" | "rules" | "facts" |
                  "export" | "import" | "module" |
		   <predicate name>"/"<arity> ]
default		[ "module" | "schema" ] [ <module name> ]
exit

!!
![ <pattern> ]
history
alias		<alias_name> [ <alias_string> ]
unalias		<alias name>
set		[ <option> ] [ <option value> ]
edit		[ "-e" <editor> ] [ <filename> ]

Remarks

[ ] means optional.
... means a sequence.

UNIX-BASED COMMANDS

pwd
ls		[ <directory> ... ]
cd		[ <directory> ]
popd		[ <directory> ]
pushd		[ <directory> ]
more		[ <filename> ]
unix		[ <unix command string> ]

REMARKS

Similar to the corresponding commands on unix shell.

BASIC COMMANDS

open		[ <ldl++ schema and/or rules filename> ... ]
close
initdb		[ <ldl++ facts filename> ... ]
savedb		<ldl++ database filename>
getdb		[ <ldl++ database filename> ]
releasedb
compile		[ <exported query form> ... ]
query		[ <predicate> ]
insert		[ <ground predicate> ]
delete		[ <predicate> ]
display		[ "schema" | "rules" | "facts" | "export" | "import" | "module" |
		  <predicate name>"/"<arity> ]
default		[ "module" | "schema" ] [ <module name> ]
exit

REMARKS: Main commands and their meaning

• "load" and "open" are the same command and they load schema and rules from a file.
• "initdb" initializes the local database with facts in predicate format from a file.
• "close" removes the current set of schema, rules and facts.
• "savedb" dumps the local database into a file with internal format.
• "releasedb" destroys all data in the local database.
• "getdb" loads the local database from a file with internal format.
• "compile" compiles a sequence of query forms into an interpretive form.
• "query" queries against the local database.
• "insert" adds a tuple into the local database.
• "delete" removes tuple(s) from the local database.
• "display" shows all or part of the current environment of the system.
• "default" shows or changes the default schema and rule module.
• "exit" quits from the system.

Other Commands

!!
![ <pattern> | <history index> ]
history
alias		<alias_name> [ <alias_string> ]
unalias		<alias name>
edit		[ "-e" <editor> ] [ <filename> ]
set		[ <option> ] [ <option value> ]

REMARKS:
• Command completion is provided and the user is prevented from typing in wrong commands.
  "!!" executes the last command.
  "!<pattern>" executes the past command that has a prefix matching the pattern.
• "!<history index>" executes the past command with that history index.
• "history" shows the history of all entered commands.
• "alias" allows additional naming of commands.
• "unalias" removes an alias.
• "edit" invokes the appropriate editor.
• "set" changes the vlaue of the various options, described below:

  OPTION TYPES	OPTION VALUES	DEFAULT VALUES
  compile	{ shallow, deep }	shallow
  editor	{ emacs, vi, ... }	emacs
  duplicate	{ yes, no }	no
  reorder	{ yes, no }	no
  trace	{ 0, 1, ... 4 }	0
  optimizer	{ 0, 1, ... }	0
  timer	{ on, off }	off
  database_size	?	8388608 (8 Mbytes)

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  Carlo Zaniolo, 1997