摘要：
man ls |col -b >ls.txtwhatis ducd - 前一目录cd 直接回家tree makir -p /home/dir1/dir2/dir3head -5 /etc/passwd tailsudo /etc/init.d/apache2 stop文件默认不能授予x权限，默认644.bashrc aliasname='ubuntu' echo $name export n='ubuntu' 子shell中查看 bash unset name环境变量 SHELL USER PATH MAIL LANG PS1执行顺序 && 阅读全文
