vi /etc/profile
bash 3.0,文件末尾添加
export HISTTIMEFORMAT="%Y-%m-%d %H:%M:%S "
或
export HISTTIMEFORMAT="%F %T "
bash 3.0 以前版本,文件末尾添加
export PROMPT_COMMAND='{
date "+: %c; `history 1 | { read x cmd; echo "$cmd"; }`";
} >> $HOME/.history-timestamp'