UNIX-Operating-System
Question 1 |
The contents of the text file t1.txt containing four lines are as follows:
a1 b1 a2 b2 a3 b2 a4 b1
The contents of the text file t2.txt containing five lines are as follows:
a1 c1 a2 c2 a3 c3 a4 c3 a5 c4
Consider the following Bourne shell script:
awk - F''' {Print S1, S2} ' t1.txt |
while read a b ; do
awk -v aV = Sa - v bV = Sb - F''
'aV = = S1 (print aV, bV, S2 )'t2.txt
done
Which one of the following strings will NOT be present in the output generated when the above script in run? (Note that the given strings may be substrings of a printed line.)
"b1 c1" | |
"b2 c3" | |
"b1 c2" | |
"b1 c3" |
Question 1 Explanation:
Note: Out of syllabus.
Question 2 |
A unix file may be of the type:
Regular file | |
Directory file | |
Device file | |
Any one of the above |
Question 2 Explanation:
Regular(Ordinary) file: Ordinary files contain ASCII (human-readable) text, executable program binaries, program data, and more.
Directory File: A directory file contains an entry for all files or subdirectories that it contains.
Special(device) file: It contains information about all the devices connected to the system.
Directory File: A directory file contains an entry for all files or subdirectories that it contains.
Special(device) file: It contains information about all the devices connected to the system.
Question 3 |
The unix command: $vi file1 file2
Edits file1 and stores the contents of file1 in file2 | |
Both files i.e. file1 and file2 can be edited using 'ex' command to travel between the files | |
Both files can be edited using 'mv' command to move between the files | |
Edits file1 first, saves it and then edits file2 |
Question 3 Explanation:
$vi file1 file2 → Both files i.e. file1 and file2 can be edited using 'ex' command to travel between the files.
Question 4 |
Consider the following statements :
(a) UNIX provides three types of permissions
* Read
* Write
* Execute
(b) UNIX provides three sets of permissions
* permission for owner
* permission for group
* permission for others
Which of the above statement/s is/are true ?
(a) UNIX provides three types of permissions
* Read
* Write
* Execute
(b) UNIX provides three sets of permissions
* permission for owner
* permission for group
* permission for others
Which of the above statement/s is/are true ?
only (a) | |
only (b) | |
Both (a) and (b) | |
Neither (a) nor (b) |
Question 4 Explanation:
→ UNIX provides three types of permissions using octal numbers
1. Read(R or 4)
2. Write(W or 2)
3. Execute(X or 1)
→ UNIX provides three sets of permissions. Each set of permission we are having 3 types of permissions.
1. Permission for owner(RWX or 421)
2. Permission for group(RWX or 421)
3. Permission for others(RWX or 421)
→ We can change/modify permissions using chmod, chown,etc.., commands
→ We can see the permissions for every file using ls -l command
1. Read(R or 4)
2. Write(W or 2)
3. Execute(X or 1)
→ UNIX provides three sets of permissions. Each set of permission we are having 3 types of permissions.
1. Permission for owner(RWX or 421)
2. Permission for group(RWX or 421)
3. Permission for others(RWX or 421)
→ We can change/modify permissions using chmod, chown,etc.., commands
→ We can see the permissions for every file using ls -l command
Question 5 |
Match the following WINDOWS system calls and UNIX system calls with reference to process control and File manipulation.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii) | |
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii) | |
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i) | |
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i) |
Question 5 Explanation:
In UNIX Wait() system call is equivalent to windows system call is WaitForSingleObject() .
In UNIX Fork() system call is equivalent to windows system call is Create-process().
In UNIX Create() system call is equivalent to windows system call is CreateFile().
In UNIX Close() system call is equivalent to windows system call is CloseHandle()
In UNIX Fork() system call is equivalent to windows system call is Create-process().
In UNIX Create() system call is equivalent to windows system call is CreateFile().
In UNIX Close() system call is equivalent to windows system call is CloseHandle()
Question 6 |
Consider the file named ‘file 1’. In order to remove write permission to the owner and grant execute permission to others, which of the following UNIX commands in appropriate?
chmod u–w,o+x file 1 | |
chmod u-w,o-w file 1 | |
cheperum u-w, o+e file 1 | |
chmod u-w,o+e file 1 |
Question 7 |
The effect of executing the UNIX command ‘sort –t /| +1 file 1’ is ------
sorts the lines of the file 1 in ascending order and place | as delimiter | |
sorts the lines of the file 1 in descending order and place | as delimiter | |
sorts the lines of the file 1 in ascending order after skipping content upto | in each line | |
sorts the lines of the file 1 in descending order after skipping content upto | in each line |
Question 8 |
UNIX command used to compare the successive lines of file 1 with the corresponding lines if file 2 and output a 3-columnar report on lines unique to file 1, file 2 and common to both is ----------------
cmp file 1 file 2 | |
comm. File 1 file 2 | |
diff file 1 file 2 | |
comp file 1 file 2 |
Question 9 |
UNIX command used to compare the successive lines of file 1 with the corresponding lines if file 2 and output a 3-columnar report on lines unique to file 1, file 2 and common to both is ----------------
cmp file 1 file 2 | |
comm. File 1 file 2 | |
diff file 1 file 2 | |
comp file 1 file 2 |
Question 10 |
An example of a memory management system call in UNIX is
fork | |
mmap
| |
sigaction | |
execve
|
Question 10 Explanation:
Mmap is a memory management system call in UNIX.
There are 10 questions to complete.