sequentially executing background processes unix
You can execute them, sequentially, like this:
(nohup S1 && nohup S2) &Try
(echo 1 && sleep 1 && echo 2) &The double ampersand operator is described here.
Note that when using &&, S2 only runs if S1 finishes "successfully" (return code 0). This seems to be what you wanted. If you want S2 to run regardless of whether S1 succeeds, use ; instead of &&.