$cmd = "a_cmd -with a -lot of -arguments that"
 . "-spill over_eighty characters";
`$cmd`;

##</code><code>##

`a_cmd -with a -lot of -arguments that
 -spill over_eighty characters`;

##</code><code>##

# newline between "that" and "-spill" is stripped out
# before "a_cmd" is run. The command string can be
# split up to fit the screen.
qx/a_cmd -with a -lot of -arguments that
-spill over_eighty characters/x;