Shell Programming-environment variable configuration file

1.source command

After you modify the configuration file, you must log off and re-login to take effect, using the source command can not re-login

Source Configuration file

. Configuration file

The environment variable configuration file is primarily defined as a system default environment variable that is in effect for the system operating environment.

System login to load the configuration file, placed in/etc will be:

/etc/profile

/etc/profile.d/*.sh

~/.bashrc

~/.bash_profile

/etc/bashrc

2. Function of environment variable configuration file

Normal loading:

SU Switch User

The role of/etc/profile:

User variable:

LOGNAME:

MAIL:

PATH:

HOSTNAME:

Histsize:

Umask

Calling the/etc/profile.d/*.sh file

Umaks Permissions:

Maximum file permissions is 666

The maximum directory permission is 777

Permissions cannot be converted using numbers, but must use letters

Umask defined permissions are the permissions that are ready to be discarded in the system default permissions

666-033:rw-rw-rw-elimination----WX-WX = = rw-r--r--644

The role of ~/.bash_profile:

Called the ~/.BASHRC file

The directory ": $HOME/bin" is accessed after the path variable.

~/.BASHRC: Defining aliases and calling/ETC/BASHRC

The role of/ETC/BASHRC:

PS1 variable

Umask (no definition of login process)

Path variable (no definition of login process)

Calling the/etc/profile.d/*.sh file

3. Other configuration files

environment variable profile in effect when logging off

/.bash_logout

~/.bash_history

Shell Programming-environment variable configuration file