  We consider a viscous compressible barotropic flow in the interval $[0,\pi]$
with homogeneous Dirichlet boundary conditions for the flow velocity and a
constant rest state as initial data. Given two sufficiently close subintervals
$I=[\alpha_1,\alpha_2]$ and $J=[\beta_1,\beta_2]$ of $(0,1)$, a nonempty open
set $\omega \subset (1,\pi)$, and $T>0$, we construct an external force $f$
supported in $\omega$ acting on the momentum equation such that the
corresponding flow map moves the fluid particles initially occupying $I$
exactly onto $J$ in time $T$.
