Added at cheatsheet

cheatsheets/at

@@ -0,0 +1,17 @@
+# To schedule a one time task
+at {time}
+{command 0}
+{command 1}
+Ctrl-d
+
+# {time} can be either
+now | midnight | noon | teatime (4pm)
+HH:MM
+now + N {minutes | hours | days | weeks}
+MM/DD/YY
+
+# To list pending jobs
+atq
+
+# To remove a job (use id from atq)
+atrm {id}