Make Alias customizations permanent (+ common aliases) under Linux CentOS

Alias simplifies complex command strings so that a single word or a simplified command can implement complex (usually long strings with many parameters) commands.

Basic usage:

Alias Simplify command = ' actual long string command '//actual long string command usually ' original command-/option parameter '

eg. Alias Ll= ' Ls-a '

Get aliases:

Alias//To view all alias aliases currently set

To cancel an alias:

Unalias Simplify commands

eg. Unalias ll//Cancel the LL alias

Permanent entry into force:

Aliases defined directly using the alias command are invalidated after a reboot. So if you need to use aliases permanently, you need to do something about it.

modifying/defining aliases is actually the environment variable that defines the system.

The system environment variable file is/etc/profile.

But looking at the profile file, you'll notice that the file starts with a hint:

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It is therefore better not to define directly in the/etc/profile file, but to define it in/ETC/BASHRC, and after the definition is complete, make it effective by #source/ETC/BASHRC.

Or, redefine a file/etc/profile.d/alias_bash.sh (Alias_bash file name is arbitrary), and then make it effective by #source/etc/profile.d/alias_bash.

This way, you can make your own (custom) aliases permanent.

Commonly used alias command strings (according to their own habits are very different):

Alias du1= ' du-h--max-depth=1 '//View primary directory usage size (space occupied)

Alias du2= ' du-h--max-depth=2 '//View secondary directory usage size (space occupied)

Alias grep= ' grep--color=auto '//When using grep filtering, highlight filtered characters with default color (string)

(to be added)

Make Alias customizations permanent (+ common aliases) under Linux CentOS