首页 > 系统服务 > 详细

Shell study note

时间:2016-10-07 01:10:14      阅读:286      评论:0      收藏:0      [点我收藏+]

5.1


printenv

view Global variables

bash

new shell

set

Global variables and local variables

export test

Local → Global, so it can be accessed in both subshell and main shell.

unset test

Delete a variable, no $ needed.

PATH=$PATH:...

append PATH, no “” needed, export needed to make it global.

.bashrc

define own aliases


User-defined variables are lower-cased; while sys variables are upper.

test=testing;

remember there is no BLANK;

bash: new a shell, the subshell has no $test variable for it is user-defined; so it is with the subshell.

To fix this, we can “export test”, and NO $ needed.

When unset a global var, it only influent the subshell who execute this cmd.

Shell study note

原文:http://www.cnblogs.com/xiaochou/p/Shell_study_note.html

(0)
(0)
   
举报
评论 一句话评论(0
关于我们 - 联系我们 - 留言反馈 - 联系我们:wmxa8@hotmail.com
© 2014 bubuko.com 版权所有
打开技术之扣,分享程序人生!