随机字符串
# echo $RANDOM | md5sum | cut -c 1-8 024cbfdc
随机数字
# echo $RANDOM | cksum | cut -c 1-8 20613431
$ export HISTTIMEFORMAT='%F %T ' 1 2013-06-09 10:40:12 cat /etc/issue 2 2013-06-09 10:40:12 clear 3 2013-06-09 10:40:12 find /etc -name *.conf 4 2013-06-09 10:40:12 clear 5 2013-06-09 10:40:12 history 6 2013-06-09 10:40:12 PS1='\e[1;35m[\u@\h \w]$ \e[m ' 7 2013-06-09 10:40:12 PS1="\e[0;32m[\u@\h \W]$ \e[m " 8 2013-06-09 10:40:12 PS1="\u@\h:\w [\j]$ " 9 2013-06-09 10:40:12 ping google.com 10 2013-06-09 10:40:12 echo $PS1
$ export HISTCONTROL=ignoredups
$ unset export HISTCONTROL