11-29-2005
Ygor's solution will work with ksh95 or pdksh. But ksh88 only expands variables...it won't do a general parse. I am not real fond of invoking the date command with each each display of the prompt.
ksh95 has a feature called discipline functions and these can be used to create dynamic variables that work like RANDOM.
Here is a solution that will work with all three versions of ksh. If we set SECONDS, it will continue to advance. So if we set it to the number of seconds since midnight it will serve as a time-of-day clock. To get from seconds-after-midnight to hours:minutes:seconds we need to do some arithmetic. If we reference a imaginary array, we can compute a subscript for it and use side effects from the subscript computation to set other variables. A single date process is used to initialize the clock, but after that the time is computed by the shell itself.
unset _h _m _s
eval $(date "+_h=%H ;_m=%M ;_s=%S")
((SECONDS = 3600*${_h#0}+60*${_m#0}+${_s#0}))
typeset -Z2 _h _m _s
_tsub="(_m=(SECONDS/60%60)) == (_h=(SECONDS/3600%24)) + (_s=(SECONDS%60))"
_timehm='${_x[_tsub]}$_h:${_m}'
_timehms='${_x[_tsub]}$_h:$_m:${_s}'
PS1="$_timehm $ "
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LEARN ABOUT XFREE86
suspend
suspend(1) User Commands suspend(1)
NAME
suspend - shell built-in function to halt the current shell
SYNOPSIS
sh
suspend
csh
suspend
ksh
suspend
DESCRIPTION
sh
Stops the execution of the current shell (but not if it is the login shell).
csh
Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.
ksh
Stops the execution of the current shell (but not if it is the login shell).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)
SunOS 5.10 15 Apr 1994 suspend(1)