To change the owner and group owner of a file or directory, we use
chown (short for change owner). To change a new group, use the similar command
We must have root permissions to use this command.
The syntax for
chown is as follows:
$ chown [options] [owner]:[group] files
The syntax for
chgrp is very similar:
$ chgrp [options] newgroup files
Here are some functionalities of
chgrp that are used in the real world.
To change the file owner, specify the user, then the file name.
$ chown bob sampleFile.txt
The sampleFile.txt file will change user to bob.
To change the file's group owner, we set the group name after a colon (
:). This provides the same function as
$ chown :programmers todo-list.txt $ chgrp programmers todo-list.txt
$ chown bob:redditors sampleFile.txt
Here, we are changing the sampleFile.txt. The argument before the : indicates the new user, while the argument after shows the new group.
To recursively grant ownership of a directory and all files with subdirectories within, use the
$ chown -R bob /files/folder
Let's go through an example with two users: marie and bob.
marie has access to sudo commands, and wants to copy a file into bob's home directory. She would like to give bob the ownership.
$ sudo cp sampleFile.txt ~bob Password: # Copied file to bob's homepage. $ sudo ls -l ~bob/sampleFile.txt -rw-r--r-- 1 marie staff 2014-01-13 16:00 /home/bob/sampleFile.txt # bob only has read access to this file. $ sudo chown bob: ~bob/sampleFile.txt -rw-r--r-- 1 bob bob 2014-01-13 16:00 /home/bob/sampleFile.txt # Now bob has ownership and has write access.
Linux for Beginners doesn't make any assumptions about your background or knowledge of Linux. You need no prior knowledge to benefit from this book. You will be guided step by step using a logical and systematic approach. As new concepts, commands, or jargon are encountered they are explained in plain language, making it easy for anyone to understand.$ Check price
Stretch out your back and relieve your back muscles with inversion therapy. This device counteracts the forces of gravity on the body by decompressing and elongating the spine. By using this product just ten minutes a day, you can be well on your way to improved circulation and posture while relieving muscle aches, back pain and stress.$$ Check price