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Listing 3.

#----------------------------------------
ex -s $TARGET >/dev/null <<E_O_F
1
/three/
a
This line is added after the first line containing three.
 .
wq!
E_O_F
#----------------------------------------
ex -s $TARGET >/dev/null <<E_O_F
1
/three/
i
This line is added before the first line containing three.
 .
wq!
E_O_F
#----------------------------------------
ex -s $TARGET >/dev/null <<E_O_F
$
a
This line is added at the bottom of the file.
 .
wq!
E_O_F