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Allow Write Permissions on a Directory to a Specific User in Linux

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If you want to change the user owning this file or directory (folder), you will have to use the command chown. For instance, if you run

sudo chown username: myfolder

the user owning myfolder will be username. Then you can execute

sudo chmod u+w myfolder

to add the write permission to the username user.

But if you want to add this user to the group associated with "myfolder", you can run

sudo usermod -a -G groupname username

and then execute

sudo chmod g+w myfolder

to add the write permission to the group.

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