+@item history
+@findex history
+The @samp{history} command shows all commands kept in the history ring
+as numbered list. If the history ring contains
+@code{eshell-history-size} commands, those numbers change after every
+command invocation, therefore the @samp{history} command shall be
+applied before using the expansion mechanism with history numbers.
+
+The n-th entry of the history ring can be applied with the @samp{!n}
+command. If @code{n} is negative, the entry is counted from the end
+of the history ring.
+
+@samp{!foo} expands to the last command beginning with @code{foo}, and
+@samp{!?foo} to the last command containing @code{foo}. The n-th
+argument of the last command beginning with @code{foo} is accessible
+by @code{!foo:n}.
+
+@item su
+@findex su
+@itemx sudo
+@findex sudo
+@code{su} and @code{sudo} work as expected: they apply the following
+commands (@code{su}), or the command being an argument (@code{sudo})
+under the permissions of somebody else.
+
+This does not work only on
+the local host, but even on a remote one, when
+@code{default-directory} is a remote file name. The necessary
+proxy configuration of Tramp is performed
+@ifinfo
+automatically, @ref{Multi-hops, , , tramp}.
+@end ifinfo
+@ifnotinfo
+automatically.
+@end ifnotinfo
+Example:
+
+@example
+~ $ cd /ssh:otherhost:/etc
+/ssh:user@@otherhost:/etc $ sudo find-file shadow
+@end example
+