how to use 'alias' in linux

Many a times, you might need to create new commands from existing
commands. Sometimes, existing commands have complex options to
remember. In such cases, we can create new commands as follows:
$ alias ll='ls –l'
$ alias copy='cp –rf'
To list all declared aliases, use the following command:
$ alias
To remove an alias, use the following command:
$ unalias copy

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