+ printf("%s [options] <checkpoint> <id> <idlist>\n\n"
+ "Collect variables across events.\n\n"
+ " -h --help Print this message\n"
+ " -a --add Add ID <id> to the list <idlist>\n"
+ " -r --remove Remove ID <id> from the list <idlist>\n"
+ " -d --debug Debug to stderr\n\n"