File Permissions in Linux - rune-seregina/sys-255-fa24 GitHub Wiki

user and group setup
adduser [username]

• adds a user
  

passwd [username]

• set a password
  

groupadd [group name]

• adds a group
  

usermod -aG [group] [username]

• add user to group
  

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changing ownership and file permissions
chown [user:group] [file(s)]

• change ownership of file
  
• https://linuxize.com/post/linux-chown-command/
  

chgrp [group] [file]

• change group ownership of a file
  
• https://www.geeksforgeeks.org/chgrp-command-in-linux-with-examples/
  

chmod [3 digit code] [file]

• change access permissions
  
• https://ss64.com/bash/chmod.html < calculator for perms, very helpful!
  

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maintenance and checking perms
ls -ld

• see permissions for a directory
  

ls -l

• see permissions for files in a directory