Retrieve Linux command line history by date
[qweet@superbox ~]$ export HISTTIMEFORMAT='%F %t '
[qweet@superbox ~]$ history
1 2012-03-06 su -
2 2012-03-06 [email protected]
3 2012-03-06 mysql
4 2012-03-06 ll
5 2012-03-06 cd /opt/
6 2012-03-06 ll
7 2012-03-06 exit
8 2012-03-06 ll
9 2012-03-06 ls -lsa
10 2012-03-06 cd ../
11 2012-03-06 ll
12 2012-03-06 ll
....