1.Consider the file below: -bash-3.2$ cat info 012-34-5678 Ambercrombie, Al 01/0

Question

1.Consider the file below:

-bash-3.2$ cat info

012-34-5678          Ambercrombie, Al      01/01/72          555-1111

123-45-6789          Barton, Barbara          02/02/73          555-2222

234-56-7890          Canby, Charles          03/03/74          555-3333

345-67-8901          Danfield, Deann         04/04/75          555-4444

Provide the command to extract the names only

Display the names and phone numbers

Repeat the above and save to a file

2.Consider the file /etc/group:

Group : password : Group ID : Group List

Provide the command to:

Display the list of sudo users (i.e. users in admin group) in alphabetical order

Check for duplicated group ID

3.Using cut and paste in sequence, you can change the order of columns in a table

Consider the file below:

-bash-3.2$ cat address

Elizi Moe, 5208534566, emoe@ncsu.edu

Ma Ta, 4345667345, mta@yahoo.com

Diana Cheng, 5203456789, dcheng@asu.edu

Provide the command to change the order of the phone number and email address columns

4.Consider the file whotb below:

-bash-3.2$ cat whotb

avuong1 pts/0        2017-08-25 23:00 (10.152.100.245)

pbartakk pts/11        2017-08-25 23:29 (174.17.211.48)

zzhan281 pts/3        2017-08-25 22:52 (71.223.35.124)

jgamboa8 pts/2        2017-08-25 23:05 (71.231.248.218)

pkalungi pts/1        2017-08-25 20:12 (10.143.198.41)

ramdisk pts/20        2017-08-22 17:17 (10.106.150.87)

pbartakk pts/8        2017-08-25 22:22 (10.152.112.188)

pkalungi pts/10        2017-08-25 23:18 (10.143.198.41)

5.Display only (in order) the station #, username, and date logged in order

Sort the above in increasing order of the station #

Sort the same data in reverse order

Create a file called useron that contains only the usernames

Sort the file useron in reverse order, removing the duplicate, and saving with the same filename

Insert line numbers into the file useron above, starting at 100 and in increment of 10

Explanation / Answer

Dear student,

1.
To get the second column, name from file us ethe belwo command
ls -l | awk '{print $2}'
Change the value of 2 as per the no of column.

To get the name and phone number,
ls -l | awk '{print $2}'
ls -l | awk '{print $1}'

2.
Use the below command for displaying the list of sudo users (i.e. users in admin group) in alphabetical order
cut -f1,$(sed -n "1 s/${columnname}.*//p" datafile |
sed 's/[^ *]//g' | wc -c) < datafile

3.
The command to change the order of the phone number
and email address columns, that means we will need to swap the two columns,
use the below commans for the same,
paste <(cut -f2 fileName.txt) <(cut -f1 fileName.txt)

4. And for the fourth one the question is not clear to me, can you please provide some more information like, if there are column headers to the file data.

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