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The group access to a file can be used to safely share files between members of a group and not anyone else. To change the group of a file, use chgrp. For instance if you wish to change file foo to group bin, execute:
chgrp bin foo
Then the file would look like (after doing a ls -lg):
-rw-r--r-- 1 tot bin 0 Sep 8 17:51 foo
However, in this case, you usually must be a member of the group you are changing to, or the system will not allow such a command. To have a group created, if one does not exist with the people you want to share access to a file, you will need to contact sysgroup (see section Sysgroup, for more info.) If you wish to change the ownership of a file, use chown. For instance if you wish to change the ownership of file foo to joe, execute:
chown joe foo
Then the file would look like (after doing a ls -l):
-rwxr-xr-x 1 joe 2437 Sep 8 15:59 foo
However, you usually can not change the ownership of a file, unless you have super-user privileges.
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