shell, bash

shell : On linux, the interpreter between user and kanel, that can understand the user commands and settings and pass them on to the computer.

 

bash : Bourne Again Shell, a comon shall program. It is also responsible for letting the users configure a set of user preferences or setting.

It has 5 setting files below.

The steps to execute is

/etc/profile -> /etc/bashrc -> /.bash_profile -> /.bashrc

# Global setting file basically under the etc

/etc/profile
/etc/bashrc

# Individual setting file basically under the .(hidden)

~/.bash_profile
~/.bashrc
~/.bash_logout

 

• /etc/profile

Overall environment setting file, affect to other user.

 

• /etc/bashrc

Bourne Again Shell Run Command

Overall environment system setting file.

 

• ~/.bash_profile

Individual environment setting file to control when bash executes. It executes when user logs in. It restricted only to the individual user, not affect to other user.

 

• ~/.bashrc

Individual environment system setting file. It executes whenever bash implements. It restricted only to the individual user, not affect to other user.

$ cat .bashrc

>>>

# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)

...

 

• ~/.bash_logout

Individual environment system setting file before user logs out.  It restricted only to the individual user, not affect to other user.