2016-2-3 Linux Basic Learning 9

umask: Masking code
Files: 666-umask
Catalog: 777-umask

View Current user masking code: Umask
Set Mask CodeUmask Count
(after exiting the current user, log in again and restore the original mask code)

The administrator's Mask code is 022, the file created by default permission is 644, the directory permission created is 755
The user's mask code is 002, the file created by default permission is 664, the directory permission created is 775

The file cannot have Execute permission by default, and if the result has Execute permission, it will add 1
If the result is negative, there is no permission---

In terms of user login,type of Shell：
log-in Shell:
Log in normally via a terminal
Su-username
Su-1 USERNAME
non-sign-on Shell:
Su USERNAME
Open Command Window under graphics terminal
Self-executing shell footsteps

BASH: script interpreter
Bash's configuration file：
Global Configuration
/etc/profile,/etc/profile.d/*.sh,/ETC/BASHRC
Personal Configuration(Final failure)
~/.bash_profile, ~/.BASHRC

Profile class file
Setting environment variables
Run Commands or footsteps

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BASHRC class file
Setting Local Variables
Defining command aliases
1

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2

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3

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How does the login shell read the configuration file?
/etc/profile--/etc/profile.d/*--and/.bash_profile--~/.BASHRC--/ETC/BASHRC

How does a non-logon shell read a configuration file?
~/.BASHRC--/ETC/BASHRC-/etc/profile.d/*

This article is from the "11160930" blog, please be sure to keep this source http://11170930.blog.51cto.com/11160930/1740823

2016-2-3 Linux Basic Learning 9