Package: vim Version: 2:7.3.547-7 Severity: normal The viewdiff command is not found, but mentioned in help: $ viewdiff bash: viewdiff: command not found $ $ grep viewdiff /usr/share/vim/vim73/doc/diff.txt You may also use "viewdiff" or "gviewdiff". Vim starts in readonly mode then. $ vimdiff is installed.