command is a command to be interpreted by the shell.
bashexecute(command) lets the shell interpret command. It is useful to execute
some external code within Sollya.
bashexecute does not return anything. It just executes its argument. However, if
command produces an output in a file, this result can be imported in Sollya
with help of commands like execute, readfile and parse.
> bashexecute("LANG=C date");
Wed Feb 9 10:02:31 CET 2011