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The difference between Primary and Secondary groups in Linux

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linux-howto

http://linuxers.org – The security of a file on Linux is managed very well using the concept of ownership and permissions. There can be three kind of permissions - read, write and execute and similary the ownership is divided into three kinds too - a user, group and others. Groups are a great way to share your work or work in collaboration with others by defining a group, whose members have the write to contribute/modify/see the work. In order to understand the group divisions, lets first start with the command id t (General)