Usage TOC of a file $ tf2/guide/lab.xxx.yyy execute a specific step of the file $ tf2/guide/lab.xxx.yyy --step=4 debug a specific step of the file $ tf2/guide/lab.xxx.yyy --step=4 --debug (use debug() statement anywhere within the step) execute all the steps of the file $ tf2/guide/lab.xxx.yyy --all execute a specific step of the file with plot option $ tf2/guide/lab.xxx.yyy --step=4 --plot