Linux-Basics-Complete-Course-With-Notes-Slides

LINUX FILE PERMISSIONS

• In this lecture we will learn about various file type identifiers.

• We will also learn about various Linux file permissions that can be applied on the file or the directory.

  

  

#### Directory Permission

• To list the directory permission use

  [~]$ ls -ld /home/bob/random_dir
  

• To know the current user

  [~]$ whoami
  

• To change the change the directory

  [~]$ cd /home/bob/random_dir
  

#### File Permissions

• Linux file permissions are defined as

  

#### Modifying file permissions

• Use chmod command to modify the file permissions.

• Provide full access to owners

  [~]$ chmod u+rwx test-file
  

• Provide Read access to Owners, groups and others, Remove execute access

  [~]$ chmod ugo+r-x test-file
  

• Remove all access for others

   [~]$ chmod o-rwx test-file
  

• Full access for Owner, add read , remove execute for group and no access for others

  [~]$ chmod u+rwx,g+r-x,o-rwx test-file
  

• Provide full access to Owners, group and others

  [~]$ chmod 777 test-file
  

• Provide Read and execute access to Owners,groups and others

  [~]$ chmod 777 test-file
  

• Read and Write access for Owner and Group, No access for others.

  [~]$ chmod 660 test-file
  

• Full access for Owner, read and execute for group and no access for others.

  [~]$ chmod 750 test-file
  

#### Change Ownership

• Changes owner to bob and group to developer

  [~]$ chown bob:developer test-file
  

• Changes just the owner of the file to bob. Group unchanged.

  [~]$ chown bob andoid.apk
  

• Change the group for the test-file to the group called android.

  [~]$ chgrp android test-file