19. Given f() and main() below, calling "main 3 2 1" will print: function () { local y=$1; local z=$2; echo $x $y $z; } function main () { local x=$1; y=$2; z-$3; f $x $y $z; } (a)3 2 3 (b)3 2 2 (c)3 32 (d)3 11 (e)None of the above
19. Given f() and main() below, calling "main 3 2 1" will print: function () { local y=$1; local z=$2; echo $x $y $z; } function main () { local x=$1; y=$2; z-$3; f $x $y $z; } (a)3 2 3 (b)3 2 2 (c)3 32 (d)3 11 (e)None of the above
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
Related questions
Question
please give right answers do not use other webiste and chatgpt for this answer its giving wring answers all time please also this webiste allow exert answer 3 question i am asking only 2 question please 19 31 answer correctly
![### Practice Questions: Understanding Shell Scripting
#### Question 16:
Given `lst=(b c d e)`, the `for` loop below will print:
```bash
for a in ${!lst[@]}; do echo $a; done;
```
1. (a) 0 1 2 3
2. (b) 1 2 3 4
3. (c) b c d e
4. (d) 4
5. (e) none of the above
#### Answer:
(e) none of the above
#### Explanation:
The loop iterates over the indices of the array `lst` using `${!lst[@]}` and echoes those indices. The correct sequence of indices for `lst=(b c d e)` is `0 1 2 3`, so the correct choice is (a) 0 1 2 3.
----
#### Question 17:
Given `a=(1 2)` and `b=(x y)`, what is the Bash command to obtain `c=(1 2 x y)`?
1. (a) `$a $b`
2. (b) `($a) ($b)`
3. (c) `${a[@]} ${b[@]}`
4. (d) `${a[@]} ${b[@]}`
#### Answer:
(c) `${a[@]} ${b[@]}`
#### Explanation:
Combining arrays `a` and `b` by expanding all elements of both `a` and `b` is performed by `${a[@]} ${b[@]}`. This expands to `1 2 x y`, giving you `c=(1 2 x y)`.
----
#### 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; }
```
1. (a) 1 1 1
2. (b) 1 1 2
3. (c) 3 3 2
4. (d) 3 1 1
5. (e) None of the above
#### Answer:
(b)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5bad4e48-dad8-4710-a64b-b24b80d1efcf%2F6851a835-1fce-4b7a-b491-473d9de22b7d%2Favjyq1_processed.png&w=3840&q=75)
Transcribed Image Text:### Practice Questions: Understanding Shell Scripting
#### Question 16:
Given `lst=(b c d e)`, the `for` loop below will print:
```bash
for a in ${!lst[@]}; do echo $a; done;
```
1. (a) 0 1 2 3
2. (b) 1 2 3 4
3. (c) b c d e
4. (d) 4
5. (e) none of the above
#### Answer:
(e) none of the above
#### Explanation:
The loop iterates over the indices of the array `lst` using `${!lst[@]}` and echoes those indices. The correct sequence of indices for `lst=(b c d e)` is `0 1 2 3`, so the correct choice is (a) 0 1 2 3.
----
#### Question 17:
Given `a=(1 2)` and `b=(x y)`, what is the Bash command to obtain `c=(1 2 x y)`?
1. (a) `$a $b`
2. (b) `($a) ($b)`
3. (c) `${a[@]} ${b[@]}`
4. (d) `${a[@]} ${b[@]}`
#### Answer:
(c) `${a[@]} ${b[@]}`
#### Explanation:
Combining arrays `a` and `b` by expanding all elements of both `a` and `b` is performed by `${a[@]} ${b[@]}`. This expands to `1 2 x y`, giving you `c=(1 2 x y)`.
----
#### 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 $r; }
```
1. (a) 1 1 1
2. (b) 1 1 2
3. (c) 3 3 2
4. (d) 3 1 1
5. (e) None of the above
#### Answer:
(b)
![### Unix Command Quiz
#### 31. Determining File Size Using `ls` Command
Given the command `ls -l /home/cs288` returns the string:
```
'drwxr-xr-x 1 CS288 CS288 123 Dec 25 2013'
```
The command to find the file size `123` is:
- (a) `cut -d' ' -f3`
- (b) `cut -d' ' -f4`
- (c) `cut -f' ' -d4`
- (d) `cut -f' ' -c4`
- (e) None of the above
#### 32. Calculating Average File Size
Consider a list of file sizes `lst=(1 2 3 4 5)`, the average file size is computed by:
```bash
sum=0; n=${#lst[@]};
```
- (a) `for ((i=0;i<n;i++)); do ((sum=sum+lst[i])); done; ((avg=sum/n));`
- (b) `for x in ${!lst[@]}; do sum=\`expr $sum + $x\`; done; avg=\`expr $sum / $n\`;`
- (c) `for x in ${!lst[@]}; do ((sum=sum+lst[x])); done; ((avg=sum/n));`
- (d) All of the above
- (e) None of the above
#### 33. Listing Commands Starting with 'a'
To list commands that start with 'a' under `/bin`, you type:
- (a) `ls /bin | grep ^a`
- (b) `ls /bin | grep a*`
- (c) `ls /bin | grep a`
- (d) `ls /bin | grep a$`
- (e) None of the above
#### 34. Listing Commands Ending with 'a'
To list commands that end with 'a' under `/bin`, you type:
- (a) `ls /bin | grep ^a`
- (b) `ls /bin | grep a*`
- (c) `ls /bin | grep a`
- (d) `ls /bin | grep a$`
- (e) None of the above
#### 35. Counting Commands Starting with 'a'
To find](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5bad4e48-dad8-4710-a64b-b24b80d1efcf%2F6851a835-1fce-4b7a-b491-473d9de22b7d%2Fqr6gr5j_processed.png&w=3840&q=75)
Transcribed Image Text:### Unix Command Quiz
#### 31. Determining File Size Using `ls` Command
Given the command `ls -l /home/cs288` returns the string:
```
'drwxr-xr-x 1 CS288 CS288 123 Dec 25 2013'
```
The command to find the file size `123` is:
- (a) `cut -d' ' -f3`
- (b) `cut -d' ' -f4`
- (c) `cut -f' ' -d4`
- (d) `cut -f' ' -c4`
- (e) None of the above
#### 32. Calculating Average File Size
Consider a list of file sizes `lst=(1 2 3 4 5)`, the average file size is computed by:
```bash
sum=0; n=${#lst[@]};
```
- (a) `for ((i=0;i<n;i++)); do ((sum=sum+lst[i])); done; ((avg=sum/n));`
- (b) `for x in ${!lst[@]}; do sum=\`expr $sum + $x\`; done; avg=\`expr $sum / $n\`;`
- (c) `for x in ${!lst[@]}; do ((sum=sum+lst[x])); done; ((avg=sum/n));`
- (d) All of the above
- (e) None of the above
#### 33. Listing Commands Starting with 'a'
To list commands that start with 'a' under `/bin`, you type:
- (a) `ls /bin | grep ^a`
- (b) `ls /bin | grep a*`
- (c) `ls /bin | grep a`
- (d) `ls /bin | grep a$`
- (e) None of the above
#### 34. Listing Commands Ending with 'a'
To list commands that end with 'a' under `/bin`, you type:
- (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
#### 35. Counting Commands Starting with 'a'
To find
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