Anyone knows how to display timestamp in Solaris since "HISTIMEFORMAT" variable is not supported in ksh ?
Do you mean output from the date command? HISTTIMEFORMAt uses date format strings just like the date command - example:
date +%y-%m-%d:%H:%M
The default output (date command with no parms) is determined by one of the locale settings for LC_TIME.
ksh does not include the timestamp in the history file. If you want that feature you need to obtain or build a Korn shell with accounting and or auditing turned on. See KSH93 Auditing and Accounting.