(features.info)Korn Shell Builtins

Korn Shell Builtins
===================

   This section describes Bash builtin commands taken from `ksh'.

`fc'
          `fc [-e ENAME] [-nlr] [FIRST] [LAST]'
          `fc -s [PAT=REP] [COMMAND]'

     Fix Command.  In the first form, a range of commands from FIRST to
     LAST is selected from the history list.  Both FIRST and LAST may
     be specified as a string (to locate the most recent command
     beginning with that string) or as a number (an index into the
     history list, where a negative number is used as an offset from the
     current command number).  If LAST is not specified it is set to
     FIRST.  If FIRST is not specified it is set to the previous
     command for editing and -16 for listing.  If the `-l' flag is
     given, the commands are listed on standard output.  The `-n' flag
     suppresses the command numbers when listing.  The `-r' flag
     reverses the order of the listing.  Otherwise, the editor given by
     ENAME is invoked on a file containing those commands.  If ENAME is
     not given, the value of the following variable expansion is used:
     `${FCEDIT:-${EDITOR:-vi}}'.  This says to use the value of the
     `FCEDIT' variable if set, or the value of the `EDITOR' variable if
     that is set, or `vi' if neither is set.  When editing is complete,
     the edited commands are echoed and executed.

     In the second form, COMMAND is re-executed after each instance of
     PAT in the selected command is replaced by REP.

     A useful alias to use with the `fc' command is `r='fc -s'', so
     that typing `r cc' runs the last command beginning with `cc' and
     typing `r' re-executes the last command (Note: Aliases.).

`let'
     The `let' builtin allows arithmetic to be performed on shell
     variables.  For details, refer to Note: Arithmetic Builtins.

`typeset'
     The `typeset' command is supplied for compatibility with the Korn
     shell; however, it has been made obsolete by the `declare' command
     (Note: Bash Builtins.).