Answered Essay: Adjust the permissions under ~/other_perms/deletable so that:

Adjust the permissions under ~/other_perms/deletable so that:

Users in group albob (currently alice and bob) can change to directory ~/other_perms/deletable, can create, delete, and list files in this directory, and can view, but not modify or execute, any of the files currently in this directory. Note: if you test this as bob, make copies of the files first; you will turn in all of these files.

Expert Answer

 

The permissions under Unix/Linux are defined as

1.Read:The permission to view the files but can not modify the contents

2.Write:The permission to modify the contents of the files

3.Execute:The Permission to execute the file.

Again each file owners are divided into the following categories

1.User:User is the one who has created the file.

2.Group:All the users in the group have the same permissions on that particular file

3.Others:The other users outside the group

if you want to see the permissions given to a particular file,just type ls-l

-rwxrwr– the first – indicates that this is a file,for a directory it will be drwxrw-r–

group the remaining terms into 3,

the first rwx means the permissions with respect to owner of the directory,here all the three permissions are there

so the owner can read,modify and execute the directory

the second rw- means the permissions with respect to group,the members of the group can read,modify but they can not execute the directory,x permission is kept blank here.

the third r– means the permissions with respect to others,the other users outside the group can only read the directory but can not modify or execute.

This is how we can see the permissions assigned to a particular directory,

to adjust the permissions we use the command chmod

u-user

g-group

o-others

a-all

example chmod o=rwx file1 gives all three permissions to owner

in numeric mode permissions are represented in 3 digit octal code

read =4

write=2

execute=1

suppose if you write

chmod 764 file1

you are assigning(4+2+1)read,write execute permissions to user,(4+2)read and write permissions to group,only 4 means only read permission to others on file1.

Here in the given question

we have to change the permissions of the group such that users of the group alice and bob can create the directory list files can view but can not execute the files in the directory

that means group has only read and write permissions on the directory

chmod g=rw ~ /other_perms/deltable

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