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

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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