internal_variables 内部变量
RANDOM 随机数
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
HISTTIMEFORMAT 历史命令格式
$ 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[[email protected] W]$ e[m " 8 2013-06-09 10:40:12 PS1="[email protected]:w [j]$ " 9 2013-06-09 10:40:12 ping google.com 10 2013-06-09 10:40:12 echo $PS1
HISTCONTROL 控制
ignoredups 过滤重复
$ export HISTCONTROL=ignoredups
unset export 关闭定义
$ unset export HISTCONTROL
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