Browse topic-based Unix System practice sets.
73 practice sets · Page 4 of 4
Which statement is not true about process 0 in the Unix operating system?
Process 0 is not created by fork system call
Process 0 is a special process created when system boots
Process 0 is called init process
After forking process 1, process O becomes swapper process
Which of the following commands would return the process_id of the sleep command?
sleep 1 & echo $!
sleep 1 & echo $*
sleep 1 & echo $?
sleep 1 & echo $$
What does the following command do?
grep -vn "abc" x
It will print the specific line numbers of file x in which there is a match for the string "abc"
It will print total no of the lines in file x that match the search string "abc"
It will print all of the lines in the file x that match the search string "abc"
It will print all of the lines in file x that do not match the search string "abc", along with their line numbers
The Unix Kernel maintains two key data structures related to processes, the progress table and the user structure. Which of the following information is not a part of the user structure?
System call state
File descriptor table
Scheduling parameters
Kernel stack
A Unix file may be of the type:
Regular file
Directory file
Device file
All of the above
Match the following for Unix system calls:
| List – I | List – II |
|---|---|
| (a) exec() | (i) Creates a new process |
| (b) brk() | (ii) Replaces the core image of a process |
| (c) wait() | (iii) Changes data segment size |
| (d) fork() | (iv) Blocks caller until child terminates |
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
WOW32 is a:
Kernel - mode objects accessible through Win 32 API
Win 32 API library for creating processes and threads
Special execution environment used to run 16 bit Windows applications on 32 - bit machines
Special kind of file system to the NT name space
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
______ maintains the list of free disk blocks in the Unix file system.
I-node
Super block
File allocation table
Boot block
A part of Windows 2000 operating system that is not portable is
Device Management
Virtual Memory Management
Processor Management
User Interface
Match the following with reference to Unix shell scripts:
| List-I | List-II |
|---|---|
| (a) $? | (i) Process ID of current shell |
| (b) $# | (ii) All arguments as a single string |
| (c) $$ | (iii) Number of command line arguments |
| (d) $* | (iv) Exit status of last command |
(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
(a)-(i), (b)-(iii), (c)-(i), (d)-(iv)
The output generated by the LINUX command:
$ seq 1 2 10
will be
1 3 5 7 9
1 2 10
1 5 10
1 2 3 4 5 6 7 8 9 10
In UNIX, ______________ creates three subdirectories: 'PIS' and two subdirectories 'progs' and data from just created subdirectory 'PIS'.
mkdir PIS/progs data
mkdir PIS progs data
mkdir PIS PIS/progs PIS/data
mkdir PIS/progs PIS/data PIS
