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The kibitz script, which is a part of expect, has the path to the write program hard-coded as /bin/write. write is actually found in /usr/bin/write, so kibitz breaks unless /usr/bin/write is symlinked to /bin/write (or the script is changed). Using expect-5.26-20 and util-linux-2.8-11, kibitz prints "sh: /bin/write: no such file or directory". (I'm submitting this as a util-linux bug, though it's really an expect bug, because there is no category for expect bugs.)
*** This bug has been marked as a duplicate of 1320 ***