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CUSTOMER_CODE
SMUDE
DIVISION_CODE
SMUDE
EVENT_CODE
JULY15
ASSESSMENT_CODE BC0056_JULY15
QUESTION_TYPE DESCRIPTIVE_QUESTION
QUESTION_ID
72497
QUESTION_TEXT What are the layers of UNIX operating system? Explain.
SCHEME OF
EVALUATION
The UNIX system is actually more than strictly an operating system.
UNIX includes the traditional operating system components. In addition,
a standard UNIX system includes a set of libraries and a set of
applications. Sitting above the hardware are two components: the file
system and process control. Next is the set of libraries. On top are the
applications. The user has access to the libraries and to the applications.
These two components are what many users think of as UNIX, because
together they constitute the UNIX interface.
The part of UNIX that manages the hardware and the executing processes
is called the kernel. In managing all hardware devices, the UNIX system
views each device as a file (called a device file). This allows the same
simple method of reading and writing files to be used to access each
hardware device. The file manages read and write access to user data and
to devices, such as printers, attached to the system. It implements security
controls to protect the safety and privacy of information. In executing
processes, the UNIX system allocates resources (including use of the
CPU) and mediates accesses to the
hardware.
(10 marks)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
111205
QUESTION_TEXT
In how many phases Fsck conducts a check? Briefly explain
them.
SCHEME OF
EVALUATION
Phase 1 to 5 Explanation – Each 2 marks (10 marks)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
111206
QUESTION_TEXT
Explain the ‘find’ command by listing the options available with
their meanings.
SCHEME OF
EVALUATION
Options and meaning given in the table - each 1 mark – (8 marks)
-perm and –size with their meaning - 2 marks
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
111207
QUESTION_TEXT
What is the purpose of setting Accounts in UNIX? Explain the
concept of Previlages and its significance
SCHEME OF
EVALUATION
Purpose (3 marks)
Privileges (5 marks)
Significance (2 marks)
QUESTION_TYPE DESCRIPTIVE_QUESTION
QUESTION_ID
111210
What is the procedure for achieving the following?
QUESTION_TEXT
SCHEME OF
EVALUATION
a.
Viewing and Setting Environment variables
b.
Using shell startup files
c.
Configuring with rc files
a.
b.
c.
Viewing and Setting Environment variables (3.5 marks)
Using shell startup files(3 marks)
Configuring with rc files(3.5 marks)
QUESTION_TYPE DESCRIPTIVE_QUESTION
QUESTION_ID
111214
QUESTION_TEXT
SCHEME OF
EVALUATION
Explain the mounting and un-mounting process in UNIX
The mount Command
(5 marks)
The basic format of mount command:
# mount device mountpoint
Options:
-a: Mount all the file systems listed in /etc/fstab. Except those marked as
noauto keyword excluded by the -t flag, or those that are already
mounted.
-f: Forces the mount of an unclean file system (dangerous), or forces the
revocation of write access when downgrading a file system’s mount
status from read-write to read-only.
-r: Mounts the file system read-only.
-t fstype: Mounts the given file system as the given file system type
-U: Update mounts options on the file system.
-v: Be verbose. -w: Mounts the file system read-write.
Unmount: Un-mounting File Systems (5 marks)
Unmounting is achieved with the unmount command which requires
either the file system name or the mount point as argument.
umount /oracle
umount /fdev/hda3
umount/dev/dsk/cOt3dOs5
Unmounting a file system is not possible if you have a file open in it.
Further, just as you can’t remove a directory unless you are placed in a
directory above it, you can’t unmount a file system unless you are placed
above it. All forms take -f to force unmounting, and -v for verbosity. -a
and -A are used to unmount all mounted file systems, -A, however, does
not attempt to unmount the root tile system.