permissions

Understanding Linux File Permissions - Linux.com

• Owner/Group/All Users

• Number Permissions

  • r = 4
  • w = 2
  • x = 1

• Explicit Permissions

  Change owner

  chown user:group file1

  Remove read and write permissions on file 1 for all users

  chmod a-rw file1

  Add execute to group

  chmod g+x file1

  Remove write from user

  chmod u-w file1