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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...
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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:

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