from the ls command:

 -rw-r--r--  1  bob  users  1892  Jul 10  18:30 linux_course_notes.txt

Owner
Group
World

chmod owner group world FileName

chmod 644 myDoc.txt

4 read (r)
2 write (w)
1 execute (x)

chown OPTION... OWNER:GROUP FILE...


option and group are optional

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Resources
linux.org - File Permissions - chmod