Homework Help is Here – Start Your Trial Now!
Engineering
Computer Engineering
If someone types the following within a Unix script, what does $1 mean? for username in `awk -F: '{print $1}' /etc/passwd` 1Dollar $username First field in /etc/paswd password First number in the for loop

If someone types the following within a Unix script, what does $1 mean? for username in `awk -F: '{print $1}' /etc/passwd` 1Dollar $username First field in /etc/paswd password First number in the for loop

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
See similar textbooks
icon
Related questions
Question

UNIX Systems Programming

 

If someone types the following within a Unix script, what does $1 mean?

for username in `awk -F: '{print $1}' /etc/passwd`

  1. 1Dollar

  2. $username

  3. First field in /etc/paswd

  4. password

  5. First number in the for loop

2. A snippet from a shell script is given below:
line1 ... while read num
line2 ...do
line3 ...w[$i]=$num
line4 ...i=$((i+1))
line5 ...done < $1
line6 ...echo ${w[*]}
line7 ...echo ${#w[*]}
If the numbers entered by the user are 1 3 5 7 9 <Ctrl-D> on separate lines :
2a. What is printed (echo’ed) by the line 6 ? Answer:
__________________________________________
2b. What is printed (echo’ed) by the line 7 ? Answer:

Expert Solution
steps

Step by step

Solved in 2 steps with 2 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Similar questions
Recommended textbooks for you
Computer Networking: A Top-Down Approach (7th Edi…
Computer Networking: A Top-Down Approach (7th Edi…
Computer Engineering
ISBN:
9780133594140
Author:
James Kurose, Keith Ross
Publisher:
PEARSON
Computer Organization and Design MIPS Edition, Fi…
Computer Organization and Design MIPS Edition, Fi…
Computer Engineering
ISBN:
9780124077263
Author:
David A. Patterson, John L. Hennessy
Publisher:
Elsevier Science
Network+ Guide to Networks (MindTap Course List)
Network+ Guide to Networks (MindTap Course List)
Computer Engineering
ISBN:
9781337569330
Author:
Jill West, Tamara Dean, Jean Andrews
Publisher:
Cengage Learning
Concepts of Database Management
Concepts of Database Management
Computer Engineering
ISBN:
9781337093422
Author:
Joy L. Starks, Philip J. Pratt, Mary Z. Last
Publisher:
Cengage Learning
Prelude to Programming
Prelude to Programming
Computer Engineering
ISBN:
9780133750423
Author:
VENIT, Stewart
Publisher:
Pearson Education
Sc Business Data Communications and Networking, T…
Sc Business Data Communications and Networking, T…
Computer Engineering
ISBN:
9781119368830
Author:
FITZGERALD
Publisher:
WILEY
SEE MORE TEXTBOOKS