If SINGULAR does not come back to the prompt while calling a user defined procedure, probably a bracket or a " is missing. The easiest way to leave the procedure is to type some brackets or " and then <RETURN> .
"
3.10.1 Tracing of procedures 3.10.2 Source code debugger 3.10.3 Break points 3.10.4 Printing of data 3.10.5 libparse