Answer Posted / bhaskar

To change permission on a file we can use chmod command.
Only thing to remember that to change a file permission one
must be the owner of that file or root in that system.

the typical format of chmod is

chmod <permissions> <filename(s)>

e.g. chmod +777 examplefile

The above command will provide read, write and execute
permission to all in the file examplename.

value for read is 4
write is 2
execute is 1

now to give all permissions it becomes 4+2+1=7

first digit refers to the permission of the owner.
second digit refers to the group permission and last digit
refers to permission to all

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