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You in
this video, I'll

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tell you
about Linux permissions.

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Now, permissions come
in three different sets.

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There are basic permissions. These are the
most important, so make sure you understand

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them. There's also advanced permissions and access
control lists. They are not as important.

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The base permissions determine what the user can do
on a file and you can set them on files.

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Or even
better, on directories.

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There is the read permission
with the octal value of 4.

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An octal value is a value that consists of 3
bits and you can address from 0 up to 7

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and these octal values are used to work with the
permissions in the CHMOT command as we will see later.

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And read has the
octal value of 4.

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The meaning on files is that if you have read,
you can read contents. Basically you can open the file.

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On directories, you can list the
contents of directories with the LS command.

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Then there is write which allows you to modify file contents,
and on directories it allows you to add and remove files.

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And there is execute with the octal value of
one, which is required on files if you want to

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run the file, if it contains executable code. And
on directories it allows you to change into the directory.

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Using
the cd.

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Execute on directories may
sound a little bit odd.

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The only thing to remember is that on directories
you always need execute without execute. You can't do anything

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on a directory, so just read on a directory
doesn't work. Make sure you have read and execute.

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In the next video I'll show
you how to work with these.