change hostname linux redhat

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Ubuntu chmod Unable to change folder permissions system Prompt "Actions not allowed 2, Linux how to modify read-only files 3, Ubuntu installation

1. Ubuntu chmod Unable to change folder permissions system Prompt "actions not allowedAnswer: Require Superuser privileges sudo2, Linux How to modify read-only filesAnswer: You can use the chmod command to provide additional permissions for changing files. U means user, a for all, G for Group, R for readable, W for writable, X for executable, you can use "chmod a+w test.c" To add permissions, which is a con

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