Miscellaneous

• cutto(Cp) Let Cp be the latest choice point frame.

• cputime(T) The current cpu time is T.

• halt Halts Prolog.

• length(List,Length) The length of list List is Length.

• numbervars(Term,N,M) Numbers the variables in the term Term from N to M-1.

• repeat Succeeds repeatedly.

• savecp(Cp) Sets Cp to be the latest choice point frame.

• sort(List1,List2) Sorting List1 yields List2.

• system(Command) Executes the Unix command Command.(?)

• system(Command,Status) Executes the Unix command Command and bound Status to the status returned from the shell.

• chdir(+Atom) Change the current working directory to Atom.

• get_main_args(L) The list of arguments of the bp command is L. This predicate is useful when one wants to write stand-alone Prolog applications (see FAQ).

• set_prolog_flag(unknown,fail) Treat calls to undefined predicates as fail.

• set_prolog_flag(singleton,off) After the flag singleton is turned off, no warning message about singleton variables will be emitted by the system.

• set_prolog_flag(singleton,on) Turn the singleton flag on.

• current_prolog_flag(Flag,Value) Value is the current value that is set to the flag Flag.