Unit 9 Linux commands

1) Writing a C program that accepts input from keyboard, rather than from a file is advantageous because
A. Keyboard is a file that is already open
B. It can be used in a pipe, if it writes to stdout
C. Both (a) and (b)
D. None of the above

2) Consider the following command that invokes the executable file a.out, with the following command line arguments a .out God loves you
argv( [1][2] )corresponds to the character
A. e
B. o
C. y
D. d
3)Which of the following string functions can be used to find the last occurrence of a given character in a given string?
A.

strncmp
B.

strncpy
C.

strchr
D.

None of the above
4) The default permission bits of a file when it is created for the first time, is controlled by
A.

chmod value
B.

fmask value
C.

umask value
D.

none of the above
5) A file x is created with the following contents
echo today is:
date
If you type x.then
A. It echoes the message. followed by date.
B. It gives the desired output only if the execute permission of file x is set.
C. The desired output can be got by the command sh x. which works even if x has its execute permission not set.
D. Both (b) and (c)

6) Shell script is preferable to other forms of programming because it
A. Makes programming task easier
B. Enhances portability
C. Occupies less space
D. All of these
7) Choose the incorrect statements.
A. Shell scripts can accept arguments
B. Shell scripts are interpreted
C. Shell is a programming language
D. Shell scripts are compiled

Basic Linux commands continue