Solve the problem that the commonly used Linux command "ll" is invalid or the command is not found

question:

The commonly used command "ll" is invalid or the command is not found

reason:

The "ll" command is not a basic Linux command.
It is an alias for "ls -l".
Some versions do not directly support the "ll" command output.

1. Run "vi ~/.bashrc"
2. Check whether there is data like "alias ll='ls -l'" in the file.
3. If so, remove the "#" before the data.
4. If not, add "alias ll='ls -l'" and save.
5. Then run the "source ~/.bashrc" command and it will be successful.

vi ~/.bashrc
alias ll='ls -l'
source ~/.bashrc 

Environment variables apply to the current process

Enter the command to execute

bash

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