1⟩ If a and b are 2 variables then the meaning of a<<=b is a) b = a << b b) a = a << b c) b = b << a d) a = a << b
b) a = a << b
Linux Bash Arithmetic Expressions
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50 Linux Bash Arithmetic Expressions Questions And Answers
2⟩ Which one of the following is bit-wise 'exclusive or' operator? a) ^= b) |= c) != d) none of the mentioned
a) ^=
3⟩ Which expression use the value of the enclosed arithmetic expression? a) $(()) b) $() c) ${} d) $[]
a) $(())
4⟩ Which built-in command performs integer arithmetic in bash shell? a) let b) get c) set d) none of the mentioned
a) let
5⟩ What is the output of this program? If 1) #!/bin/bash 2) a=2 3) b=4 4) let c=a**b 5) echo $c 6) exit 0 Options a) 8 b) 16 c) 32 d) none of the mentioned
b) 16
Explanation:
'**' is the exponentation operator in bash shell.
Output:
root@ubuntu:/home/google#./test.sh
16
root@ubuntu:/home/google#
6⟩ Which one of the following is not a valid operator in bash shell? a) || b) ~ c) =<< d) -=
c) =<<
7⟩ What is the output of this program? #!/bin/bash a=10; b=20 c=$((++a)) let a=c+a echo $a exit 0 a) 21 b) 22 c) program will generate an error message d) none of the above
b) 22
8⟩ What is the output of this program? #!/bin/bash a=10 b=$(( $a<0?10$a<100 )) echo $b exit 0 a) 10 b) 20 c) 1 d) 0
c) 1
Firstly the '$a<0' condition has been checked. Because it is false hence the right hand side condition of the colon (:) has been checked and this is true so program output is 1.
9⟩ What is the output of this program? #!/bin/bash a=10 b=$(( $a<0&&$a<100 )) echo $b exit 0 a) 10 b) 0 c) 1
b) 0
The condition '$a<0' is false so logical and operator provides the output 0.
10⟩ What is the output of this program? #!/bin/bash a=1; b=2; c=3 d=$(( ++a**b*c++ + a )) echo $d exit 0 a) 14 b) 12 c) program will generate an error message d) none of the mentioned
a) 14
The operators in decreasing order of precedence are ++, **, *, +.
11⟩ Which command sets up shorthand for command or command line? a) set b) alias c) new d) echo
b) alias
12⟩ What is the function of bind command in bash shell? a) defining new macros b) defining new key bindings for existing commands c) dumping the installed key bindings d) all of the mentioned
d) all of the mentioned
13⟩ The command 'compgen -c' shows a) all variable names b) all system wide aliases c) full list of all commands d) none of the mentioned
c) full list of all commands
14⟩ Which statement resumes the next iteration of a for, while, select, or until loop? a) continue b) break c) complete d) command
a) continue
15⟩ Which command prints the directory stack? a) cd b) dirs c) popd d) pushd
b) dirs
16⟩ The command 'disown -r' a) removes all jobs b) removes all running jobs c) marks jobs to not receive SIGNUP when bash exits d) marks all jobs
b) removes all running jobs
17⟩ The command 'enable -n ' a) enables the specified built-in command b) disables the specified built-in command c) print the status of the command d) none of the mentioned
b) disables the specified built-in command
18⟩ Which command can create environment variable? a) export b) set c) read d) none of the mentioned
a) export
19⟩ Which command concatenate the specified argument into a single command, then execute the command? a) fc b) eval c) exec d) getopts
b) eval
20⟩ The command 'hash' a) manages a internal hash table b) find and remember the full path name of the specified command c) displays used command names and the number of hits d) all of the mentioned
d) all of the mentioned
