Which of the following commands or sequences of commands will rename a file x to file y in a Unix system? I. mv y, x II. mv x, y III. cp y, x (rm x) IV. cp x, y (rm x)
II and III
II and IV
l and III
Question 1 Explanation:
I. mv y, x //will move contents of file x to file y II. mv x, y //will move contents of file y to file x III. cp y, x (rm x) //will copy file x to file y (removal of x after the command) IV. cp x, y (rm x) //will move contents file y to file x (removal of x after the command) Hence Answer B
A student wishes to create symbolic links in a computer system running Unix. Three text files named "file 1", "file 2" and "file 3" exist in her current working directory, and the student has read and write permissions for all three files. Assume that file 1 contains information about her hobbies, file 2 contains information about her friends and file 3 contains information about her courses. The student executes the following sequence of commands from her current working directory
ln -s file 1 file 2 ln -s file 2 file 3Which of the following types of information would be lost from her file system? (I) Hobbies (II) Friends (III) Courses
(I) and (II) only
(II) and (III) only
(I) and (III) only
The shell command
find -name passwd -printis executed in /etc directory of a computer system running Unix. Which of the following shell commands will give the same information as the above command when executed in the same directory?
grep name passwd
grep print passwd
Question 3 Explanation:
Find is a Unix (or Linux) command used for searching the files in a directory hierarchy. The syntax of find command is :
find –name “filename” –print
Grep is a unix command which can be used to find file names with a watching string. The syntax of grep command is :
grep name “filename”
Thus, option (C) is correct.
Please comment below if you find anything wrong in the above post.
A user level process in Unix traps the signal sent on a Ctrl-C input, and has a signal handling routine that saves appropriate files before terminating the process. When a Ctrl-C input is given to this process, what is the mode in which the signal handling routine executes?
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 ?
Both (a) and (b)
Neither (a) nor (b)
Question 5 Explanation:
UNIX provides Read, Write and Execute permisision on files UNIX provides three sets of permissions
- permission for owner
- permission for group
- permission for others For more information on UNIX OS Refer:Operating System | Unix File System Both (a) and (b) are coreect. So, option (C) is correct.
Match the following WINDOWS system calls and UNIX system calls with reference to process control and File manipulation.
Question 6 Explanation:
- In UNIX Wait() is used to create-process().
- In UNIX Fork() is used for WaitForSingleObject().
- In UNIX Create() is used for CreateFile().
- In UNIX Close() is used for CloseHandle() So, option (B) is correct.
The linux command “mknod myfifo b 4 16”
Will create a character device if the user is root
Will create a named pipe FIFO if the user is root
Will create a block device if the user is root
None of the above
Which statement is not correct about “init” process in Unix?
It is generally the parent of the login shell.
It has PID 1.
It is the first process in the system.
Init forks and execs a ‘getty’ process at every port connected to a terminal.
Question 8 Explanation:
"init"(short for initialization) process in UNIX have:
- process id (PID) = 1
- It is generally the parent of the login shell.
- "init" forks and execs a ‘getty’ process at every port connected to a terminal.
- But it is not the first process in the system So, option (C) is correct.
Unix command to change the case of first three lines of file “shortlist” from lower to upper
$ tr ‘[a – z]’ ‘[A – Z]’ shortlist ¦ head-3
$ head-3 shortlist ¦ tr ‘[a – z]’ ‘[A – Z]’
$ tr head -3 shortlist ‘[A – Z]’ ‘[a – z]’
$ tr shortlist head -3 ‘[a – z]’ ‘[A – Z]’
Match the following vi commands in Unix:
Question 10 Explanation:
- w vi command in unix saves file and remains in editing mode.
- x vi command in unix saves the file and quits editing mode
- q vi command in unix quits editing mode and no changes are saved to the file
- sh vi command in unix escapes unix shell So, option (D) is correct.
There are 19 questions to complete.