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# you can change ownership of a file or directory
# by using the `chown` command with your user and
# group information like this

$ sudo chown -R USER:GROUP ~/.gem

# if you don't know your user or group, you can use
# the `id` command and look for the info in
# parentheses next to uid & gid

$ id

uid=501(rymo) gid=20(staff) groups=20(staff)