whos.options(exclude, report.S4.size)
whos.exclude(x = NULL, pattern, envir = parent.frame())
whos.include(x = NULL, pattern, envir = parent.frame())object.size can take an annoyingly long time (seconds), set
this option to FALSE to skip it and get quicker execution.pattern="^my\..*" will exclude or include
"my.vector" and "my.matrix" but not "mysql.con".