7 types of files
- regular
d directory
l symbolic link
c character special file (hardware files)
b block special file (files to communicate with hardware )
p named pipe (to pass data between process )
s socket ( mechanism for inter-process communication
The expression expr -9 % 2 evaluates to a) 0 b) 1 c) -1 d) 2
What is the output of the following program? b = [ -n $b ] echo $? [ -z $b ] echo $? a) 1 1 b) 2 2 c) 0 0 d) 0 1
What is the output of the following code os=Unix echo 1.$os 2."$os" 3.'$os' 4.$os a) 1.Unix 2.Unix 3.Unix 4.Unix b) 1.Unix 2.Unix 3.$os 4.Unix c) 1.Unix 2.Unix 3.Unix 4.$os d) 1.Unix 2.$os 3.$os 4.$os
Create a new file "new.txt" that is a concatenation of "file1.txt" and "file2.txt"? a) cp file.txt file2.txt new.txt b) cat file1.txt file2.txt > new.txt c) mv file[12].txt new.txt d) ls file1.txt file2.txt | new.txt
What will be output of following command $ echo "The process id is" $$$$ a) The process id is $$ b) The process id is $<pid>$<pid> c) The process id is <pid><pid> d) The process id is $$$$
What is the return value ($?) of this code
os = Unix
[$osName = UnixName] && exit 2
[${os}Name = UnixName] && exit 3
a) 0
b) 1
c) 2
d) 3Which of these is not a valid variable in bash a) __ (double underscore) b) _1var (underscore 1 var ) c) _var_ (underscore var underscore) d) some-var (some hyphen var)
How do you print the lines between 5 and 10, both inclusive? a) cat filename | head | tail -6 b) cat filename | head | tail -5 c) cat filename | tail +5 | head d) cat filename | tail -5 | head -10
What would be the current working directory at the end of the following command sequence? $ pwd /home/user1/proj $ cd src $ cd generic $ cd . $ pwd a) /home/user1/proj b) /home/user1/proj/src c) /home/user1 d) /home/user1/proj/src/generic
Tell me which of the following commands allows definition and assignment of environment variables under bash a) env b) export c) environ d) setenviron
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