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ksh PS4 variable assign to `date` output

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# 1  
Old 10-29-2013
ksh PS4 variable assign to `date` output
Hi guys,
Is there a way to assign curent time to PS4 variable in ksh. My goal is to have each line produced by 'set -x' command to have a time stamp.
Here is my code:

Code:
$cat test
#!/usr/bin/ksh
export PS4="`date` [${LINENO}]"
set -x
echo "TRACE LINE ONE"
echo "I WILL SLEEP FOR 10 SEC"
sleep 10
echo "TRACE LINE TWO"
exit 0
$

and this is an output:

Code:
$./test
Tue Oct 29 10:05:53 EDT 2013 [2]echo TRACE LINE ONE
TRACE LINE ONE
Tue Oct 29 10:05:53 EDT 2013 [2]echo I WILL SLEEP FOR 10 SEC
I WILL SLEEP FOR 10 SEC
Tue Oct 29 10:05:53 EDT 2013 [2]sleep 10
Tue Oct 29 10:05:53 EDT 2013 [2]echo TRACE LINE TWO
TRACE LINE TWO
Tue Oct 29 10:05:53 EDT 2013 [2]exit 0
$

Note: the time stamp remains the same although 'sleep 10' should have change it.
May be someone know how to make the time to change dynamically
I am in ksh88.
Thanks a lot for any advice.....
# 2  
Old 10-29-2013
You would either need to use a loop or call the date command again after the sleep command to grab the current time.
# 3  
Old 10-29-2013
Try this (untested with ksh88 but works with ksh93):
Code:
PS4='$(date) [${LINENO}]'

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