Question

Hi im trying too do my Linux homework and I'm stuck on some questions

1. Using the utility chmod, permissions can be set on the owner, group, or others (aka "the world" or "everyone else").

True or False

2. Changing the permissions on the script file someScriptFile.sh to be write and read only will allow you to execute it (if it is a valid shell script with no errors) using ./someScriptFile.sh

True or False

3. To set the permissions for the owner, group and others on the file 'someStuffInThisFile.bak' to ONLY r (read) use the command:

Assume umask = 0000

chmod a=r

chgbits a=r

filemod a=r

chmod a>r

chmod a=rwx

setperms +read

Run the file ./setperms +r someStuffInThisFile.bak

4. The command chmod ugo=rwx anotherBigFile will: (assume umask = 0022)

will add read, write, execute permissions to the owner, group, and others.

will only modify permissions owned by the group

will only modify permissions owned by the owner

will only modify permissions owned by the others

will only modify permissions owned by Linus Torvalds

5. The octal notation value for a read permission is 1 (one).

True or False

6. Which octal notation turns on each rwx bit for the owner, group, and others:

777

447

757

000

111

on, on, on

7. Which command will set the permissions rwxr--r-- on the file doNotDeleteFile

chmod 744 doNotDeleteFile

chmod 117 doNotDeleteFile

chmod 171 doNotDeleteFile

chmod 664 doNotDeleteFile

chmod 770 doNotDeleteFile

8. The command used to set (or view) how the permissions are applied when you create a file or directory is called:

mask

perm

umask

set

set mask

chmod -u filename

Answer 1

1. Answer : True

2. Answer True
Reason : To execute file execution permission also required.

3. chmod a=r
Reason :
a --> All three
= --> The modes specified are to be made the exact modes for the specified classes

4. The command chmod ugo=rwx anotherBigFile will: (assume umask = 0022)
will add read, write, execute permissions to the owner, group, and others.

5. False
Reason :
0   No permission
1   Execute permission
2   Write permission
3   Execute and write permission
4   Read permission

6. 777
Reason : 7   [All permissions: 4 (read) + 2 (write) + 1 (execute) = 7]   [rwx]

7. chmod 744 doNotDeleteFile

8. mask