do not show usage screen without args, but use cat mode
tree86237a37302f027fd07e718685414dccdb22a9ea
-rw-r--r-- 20 .gitignore
-rw-r--r-- 34680 COPYING
-rw-r--r-- 1008 Makefile
-rw-r--r-- 1726 README.md
-rw-r--r-- 20329 jobflow.c
drwxr-xr-x - tests