KYEO
Fugazi
Steady Diet of Nothing
Track #11
1991

This is the main riff:
E|----------------------------|
B|----------------------------|
G|-----14--12-----------------|
D|--14---------14--12h13h14---|
A|----------------------------|
E|----------------------------|

Sometimes it's played an octave higher:
e|-----17--15-----------------|
B|--17---------17--15h16h17---|
G|----------------------------|
D|----------------------------|
A|----------------------------|
E|----------------------------|

Just listen to the song, the rhythm is pretty easy to pick up on

Enjoy :)