Example 1-9 Changing permission of a file or directory chmod

• To change permission of a given file we use command chmod.

• chmod +x file : add executable permission

• chmod 700 file : gives full permission to the user and no permission to others.

• chmod 755 file: gives full permission to the user and only read and execute permission to the others.

• To apply a given permission to all files within a given directory, use chmod -r directory_name