Linux Basics (7) Modify the owner of the file, belong to the group, permissions

Modify the owner of the file under Linux, the group and the permissions of the command has chown chmod chgrp umask

1.chown Modify the owner of the file

chown [options] username file_name ...

-R Recursive modification if file is a directory

Chown can also be used to modify the owner of the user, belong to the group

Chown username.grpname file_name

or Chown username:grpname file_name

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2.chmod permissions to modify files

Chomod MODE File ... Mode can be a decimal value corresponding to three sets of permissions.

-R Recursive modification

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You can also modify permissions for a class of users (Owner,group,others)

Modify a class of users or a class (belong to the main U Group G other people o everyone a) User rights:

U,g,o,a

chmod user category =mode file,...

Modify some or some bit permissions for a class of users:

U,g,o,a

chmod user category +|-mode file,.. (+ represents the addition of a permission, which means that a permission is removed).

Remove the executable permission of 1.txt

chmod a-x 1.txt

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3.chgrp change Genus Group #so easy Skip

4.umask Mask code used to set the file to define permissions that cannot be created at the time of file creation

In the creation of the file, with 666-matte code to get the file's permissions #注意, the file default is not x permission, if the result has X permission, you should add its permissions 1

When creating a table of contents, the result of subtracting the 777-mask code is the permissions of the directory

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Linux Basics (7) Modify the owner of the file, belong to the group, permissions