Trick The First: filtering ps
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So you know how ps piped to grep shows you the grep command?

    $ ps auxww | grep bash
    ben      64291   0.0  0.0  2435036    372 s001  R+   11:48AM   0:00.00 grep bash
    ben      61887   0.0  0.0  2435468   1896 s001  S    11:38AM   0:00.13 -bash
    ben      61376   0.0  0.0  2435468   1888 s000  S+   10:46AM   0:00.06 -bash

I don't understand why, but if you wrap the first character of your grep
in a character class, that doesn't happen:

    $ ps auxww | grep [b]ash
    ben      61887   0.2  0.0  2435468   1892 s001  S    11:38AM   0:00.14 -bash
    ben      61376   0.0  0.0  2435468   1888 s000  S+   10:46AM   0:00.06 -bash

Trick The Second: Oops, I forgot my &&
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Sometimes you start a long-running process:

    $ ./something_long

...and then realize that you want something else to happen after it, as
though you had done:

    $ ./something_long && ./something_else

...but of course you forgot to do that at first. Try this on for size:

    $ sleep 30
    ^Z
    [1]+  Stopped                 sleep 30
    $ fg && echo "done"
    sleep 30
    done