Red Hat Linux 9 now uses yet another method to control the keyboard and
mapping of keys.  (actually, the older xmodmap method still works.)

In order to swap the "Caps Lock" and ctrl keys, I now need to do:

setxkbmap -layout us -model pc105 -option "" \
   -symbols "pc/pc(pc105)+pc/us+ctrl(swapcaps)"

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To tailor for your situation, first run "redhat-config-keyboard" from an
X-windows terminal.  This will pop open their keyboard utility, and send a
message to your terminal telling you what commands it will execute.  In my
case, selecting the "U.S. English" keyboard generates the following
information:

$ redhat-config-keyboard
Loading //lib/kbd/keymaps/i386/qwerty/us.map.gz
* running ['/usr/X11R6/bin/setxkbmap', '-layout', 'us', '-model', 'pc105', '-option', '']

The equivalent way to do this from the command line is:

setxkbmap -layout us -model pc105 -option "" \
   -symbols "pc/pc(pc105)+pc/us"

We append "+ctrl(swapcaps)" to the list of symbols to do what we want.

Possible symbol choices are listed in /usr/X11R6/lib/X11/xbk/symbols.  For
example, "pc/pc(pc105)" refers to the pc105 section of file pc in directory
subdirectory pc of xkb/symbols.  Symbols options are separated by "+".

(Source code for redhat-config-keyboard is in
/usr/share/redhat-config-keyboard/.)

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Put this in a shell script ~/bin/swap-caps.sh, and automatically startup by
putting "swap-caps.sh" (without ~/bin) in Start Here, Preferences, More
Preferences, Sessions, Startup Programs.

More info:

/usr/X11R6/lib/X11/xkb

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To set the keymap used in VGA mode (simple text screen, not in X-windows):

dumpkeys > us.map
cp us.map us-swapcaps.map

Make the following modifications:
 
$ diff us.map us-swapcaps.map
0a1,6
> # us_greg.map
> # Modified version of US keyboard, to swap "Caps Lock" and left "Ctrl" keys.
> # Greg Hammett
> #
> # left Backspace and delete alone (which are okay in text/VGA virtual ttys).
> #
36c42
< keycode  29 = Control
---
> keycode  29 = Caps_Lock       # this key is labelled "Ctrl" in lower left
70c76
< keycode  58 = Caps_Lock
---
> keycode  58 = Control         # this key is labelled "Caps Lock" on left
$
 
gzip us-swapcaps.map
cp -p us-swapcaps.map.gz /lib/kbd/keymaps/i386/qwerty
# cp -p us-swapcaps.map.gz /usr/lib/kbd/keymaps/i386/qwerty # in Linux 7.0
# cp -p us-swapcaps.map.gz /usr/lib/kbd/keytables  # on older Linux, put here
# /usr/sbin/kbdconfig      # and select us-swapcaps

But kbdconfig doesn't exist anymore!  So have to edit
/etc/sysconfig/keyboard by hand, and replace KEYTABLE="us" with
KEYTABLE="us-swapcaps"