31. Assuming ls -1 /home/cs288 returns a string 'drwxr-xr-x+ 1 CS288 CS288 123 Dec 25 2013' the command to find the file size 123 is (a)cut-d'' -£3 (d)cut -f' ' -d4 (b)cut -d' - £4 (e)none of the above (c)cut -f' -d4 "
31. Assuming ls -1 /home/cs288 returns a string 'drwxr-xr-x+ 1 CS288 CS288 123 Dec 25 2013' the command to find the file size 123 is (a)cut-d'' -£3 (d)cut -f' ' -d4 (b)cut -d' - £4 (e)none of the above (c)cut -f' -d4 "
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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please give right answers do not use other webiste and vhatgpt for this answer its giving wring answers all time please 18 19 31 answer correctly
![### Shell Scripting and Command Line Exercises
#### 31. Command to Find File Size
Assuming the command `ls -l /home/cs288` returns a string like `'drwxr-xr-x 1 CS288 CS288 123 Dec 25 2013'`, determine the command to find the file size `123`.
Options:
- (a) `cut -d' ' -f3`
- (b) `cut -d' ' -f4`
- (c) `cut -f' ' -d4`
- (d) `cut -f' ' -d4`
- (e) none of the above
#### 32. Average File Size Calculation
Consider a list of file sizes `lst=(1 2 3 4 5)`. The average file size is computed by:
Options:
- (a)
```bash
n=${#lst[@]};
sum=0;
for ((i=0;i<n;i++)); do
((sum=sum+lst[i]));
done;
((avg=sum/n));
```
- (b)
```bash
n=${#lst[@]};
sum=0;
for x in ${lst[@]}; do
sum=`expr $sum + $x`;
done;
avg=`expr $sum / $n`;
```
- (c)
```bash
n=${#lst[@]};
sum=0;
for x in ${!lst[@]}; do
((sum=sum+lst[x]));
done;
((avg=sum/n));
```
- (d) all of the above
- (e) none of the above
#### 33. Commands Starting with 'a'
To list commands that start with 'a' under `/bin`, you type:
Options:
- (a) `ls /bin | grep ^a`
- (b) `ls /bin | grep a*`
- (c) `ls /bin | grep a`
- (d) `ls /bin | grep a$`
- (e) none of the above
#### 34. Commands Ending with 'a'
To list commands that end with 'a' under `/bin`, you type:
Options:
- (a) `ls /bin | grep ^a`
- (b) `ls /bin | grep a*`
- (c)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5bad4e48-dad8-4710-a64b-b24b80d1efcf%2Fec5b23b5-b5be-401a-bafa-a02e923c9482%2F4ummazh_processed.png&w=3840&q=75)
Transcribed Image Text:### Shell Scripting and Command Line Exercises
#### 31. Command to Find File Size
Assuming the command `ls -l /home/cs288` returns a string like `'drwxr-xr-x 1 CS288 CS288 123 Dec 25 2013'`, determine the command to find the file size `123`.
Options:
- (a) `cut -d' ' -f3`
- (b) `cut -d' ' -f4`
- (c) `cut -f' ' -d4`
- (d) `cut -f' ' -d4`
- (e) none of the above
#### 32. Average File Size Calculation
Consider a list of file sizes `lst=(1 2 3 4 5)`. The average file size is computed by:
Options:
- (a)
```bash
n=${#lst[@]};
sum=0;
for ((i=0;i<n;i++)); do
((sum=sum+lst[i]));
done;
((avg=sum/n));
```
- (b)
```bash
n=${#lst[@]};
sum=0;
for x in ${lst[@]}; do
sum=`expr $sum + $x`;
done;
avg=`expr $sum / $n`;
```
- (c)
```bash
n=${#lst[@]};
sum=0;
for x in ${!lst[@]}; do
((sum=sum+lst[x]));
done;
((avg=sum/n));
```
- (d) all of the above
- (e) none of the above
#### 33. Commands Starting with 'a'
To list commands that start with 'a' under `/bin`, you type:
Options:
- (a) `ls /bin | grep ^a`
- (b) `ls /bin | grep a*`
- (c) `ls /bin | grep a`
- (d) `ls /bin | grep a$`
- (e) none of the above
#### 34. Commands Ending with 'a'
To list commands that end with 'a' under `/bin`, you type:
Options:
- (a) `ls /bin | grep ^a`
- (b) `ls /bin | grep a*`
- (c)
![### Bash Programming Multiple Choice Questions (MCQs)
#### Question 16:
Given `lst=(b c d e)`, the `for` loop below will print:
```bash
for a in ${!lst[@]}; do echo $a; done;
```
This results in:
- (a) 0 1 2 3
- (b) 1 2 3 4
- (c) b c d e
- (d) 4
- (e) None of the above
#### Question 17:
Given `a=(1 2)` and `b=(x y)`, what is the Bash command to obtain `c=(1 2 x y)`?
- (a) ($a $b)
- (b) ($a) ($b)
- (c) ${a[@]} ${b[@]}
- (d) ${a[@]} ${b[@]}
- (e) None of the above
#### Question 18:
Given `f()` and `main()`, what is the output when `main` is called?
```bash
function f() { local p=$2; q=1; r=1; }
function main() { p=1; q=2; r=3; f $p $q $r; echo $p $q $r; }
```
This results in:
- (a) 1 1 1
- (b) 1 1 2
- (c) 3 3 2
- (d) 3 1 1
- (e) None of the above
#### Question 19:
Given `f()` and `main()` below, calling `main 3 2 1` will print:
```bash
function f() { local y=$1; local z=$2; echo $x $y $z; }
function main() { local x=$1; y=$2; z=$3; f $x $y $z; }
```
This results in:
- (a) 3 2 3
- (b) 3 2 2
- (c) 3 3 2
- (d) 3 1 1
- (e) None of the above
#### Question 20:
Determine the output for the Bash statements:
```bash
x=12; y=123](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5bad4e48-dad8-4710-a64b-b24b80d1efcf%2Fec5b23b5-b5be-401a-bafa-a02e923c9482%2Fcai4avi_processed.png&w=3840&q=75)
Transcribed Image Text:### Bash Programming Multiple Choice Questions (MCQs)
#### Question 16:
Given `lst=(b c d e)`, the `for` loop below will print:
```bash
for a in ${!lst[@]}; do echo $a; done;
```
This results in:
- (a) 0 1 2 3
- (b) 1 2 3 4
- (c) b c d e
- (d) 4
- (e) None of the above
#### Question 17:
Given `a=(1 2)` and `b=(x y)`, what is the Bash command to obtain `c=(1 2 x y)`?
- (a) ($a $b)
- (b) ($a) ($b)
- (c) ${a[@]} ${b[@]}
- (d) ${a[@]} ${b[@]}
- (e) None of the above
#### Question 18:
Given `f()` and `main()`, what is the output when `main` is called?
```bash
function f() { local p=$2; q=1; r=1; }
function main() { p=1; q=2; r=3; f $p $q $r; echo $p $q $r; }
```
This results in:
- (a) 1 1 1
- (b) 1 1 2
- (c) 3 3 2
- (d) 3 1 1
- (e) None of the above
#### Question 19:
Given `f()` and `main()` below, calling `main 3 2 1` will print:
```bash
function f() { local y=$1; local z=$2; echo $x $y $z; }
function main() { local x=$1; y=$2; z=$3; f $x $y $z; }
```
This results in:
- (a) 3 2 3
- (b) 3 2 2
- (c) 3 3 2
- (d) 3 1 1
- (e) None of the above
#### Question 20:
Determine the output for the Bash statements:
```bash
x=12; y=123
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