How do run a command without internet access?

While I have access to the Internet, how can I execute a command that does not have access to the Internet?

One simple way is to use firejail and block network access with it.

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firejail is for programs and set config firejail
It is not possible to create configuration for normal commands

What do you mean “normal commands”? Unless they are shell builtins, all commands are programs.

For example, if you want a bash shell without network access: firejail --net=none bash

You should be able to replace bash with almost any command.

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Oh, I thought I should make a firejail config for each command

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