Shell Programming and Scripting

a.ksh | sh

#!/bin/ksh
x=0
while [ $x -le 100 ]
do
  echo "trap 'PS1=\"\$(date ) > \"'" $x
  (( x = x + 1 ))
done

sh[49]: 48: The specified trap syntax is not correct.

$ a.ksh | sh
DEBUG : Max recursion reached it's limit, exiting
$

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="$_timehms $ "

 $ . ./setprompt
09:25:27 $ 
09:25:38 $

#!/bin/ksh
x=0
while [ $x -le 65 ]
do
  trap 'PS1="$(date ) > "' $x
  (( x = x + 1 ))
done

a.ksh

./a.ksh[6]: 48: bad trap

$ a.ksh | sh
$
$ echo $SIGCHLD
 
$