this simply hangs unless i hit control-C

In [1]: rm crash-20110606-112922-satra-segstats.npz
remove crash-20110606-112922-satra-segstats.npz? ^C

this works fine.

In [1]: !rm crash-20110606-112922-satra-segstats.npz

affects any kernel frontend (qtconsole, notebook, etc.)