history - list previous commands and their event numbers
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   history [-h] [<num>]

   Lists previous commands and their event numbers. This is a UNIX-like history
   mechanism inside the VIS shell.

   Command options:

   -h
          Print the command usage.

   <num>
          Lists the last <num> events. Lists the last 30 events if <num> is not
          specified.

   History Substitution:

   The history substitution mechanism is a simpler version of the csh history
   substitution mechanism. It enables you to reuse words from previously typed
   commands.

   The default history substitution character is the `%' (`!' is default for
   shell  escapes, and `#' marks the beginning of a comment). This can be
   changed using the "set" command. In this description '%' is used as the
   history_char. The `%' can appear anywhere in a line. A line containing a
   history substitution is echoed to the screen after the substitution takes
   place. `%' can be preceded by a `\' in order to escape the substitution, for
   example, to enter a `%' into an alias or to set the prompt.

   Each valid line typed at the prompt is saved. If the "history" variable is
   set (see help page for "set"), each line is also echoed to the history file.
   You can use the "history" command to list the previously typed commands.

   Substitutions:

   At any point in a line these history substitutions are available.

   %:0
          Initial word of last command.

   %:n
          n-th argument of last command.

   %$
          Last argument of last command.

   %*
          All but initial word of last command.

   %%
          Last command.

   %stuf
          Last command beginning with "stuf".

   %n
          Repeat the n-th command.

   %-n
          Repeat the n-th previous command.

   ^old^new
          Replace "old" with "new" in previous command. Trailing spaces are
          significant during substitution. Initial spaces are not significant.
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   Last updated on 20100410 00h02