history command with time

How do I display shell command history with date and time under UNIX or Linux operating systems? http://www.cyberciti.biz/faq/unix-linux-bash-history-display-date-time/ http://www.tecmint.com/history-command-examples/ If the HISTTIMEFORMAT is set, the time stamp information associated with each history entry is written to the history file, marked with the history comment character. Defining the environment variable as follows: $ HISTTIMEFORMAT="%d/%m/%y %T " OR $ echo 'export HISTTIMEFORMAT="%d/%m/%y %T "' >> ~/.bash_profile Where, %d - Day %m - Month %y - Year %T - Time To see history type $ history Sample outputs: .... .. 986 11/03/10 04:31:36 memcached-tool 10.10.28.22:11211 stats 987 11/03/10 04:31:36 w 988 11/03/10 04:31:37 iostat 989 11/03/10 04:31:37 top 990 11/03/10 04:31:37 at 991 11/03/10 04:31:38 atop 992 11/03/10 04:31:40 collectl 993 11/03/10 04:31:41 grep CPU /proc/cpuinfo 994 11/03/10 04:31:45 vmstat 3 100 995 11/03/10 04:31:55 sar -W -f /var/log/sa/sa12 .... .. References: For more info type the following commands: man bash help history man 3 strftime