Question

PLEASE USE LINUX/UNIX

1.Use either pico, vi, or cat to create the following file and name it as “mysedfile”:

Name Class1 Class2 Class3

Tom 92 94 88

Nancy 91 85 95

Lisa 99 77 96

Jerry 84 98 90

2. Please use sed command(s) to complete the following tasks.

1. 1. display Tom’s record.
2. 2. display Lisa’s record.
3. 3. display both Tom’s and Lisa’s records.
4. 4. remove the blank line(s) from “mysedfile.”
5. 5. replace all the digits with *.

Answer 1

All the question were executed on Linux Unbuntu.

Let me know if you have any doubts or need any modifications.

mysedfile is in desktop.

mysedfile

display Tom’s record.

sed -n '/Tom/p' mysedfile

SED command in UNIX is stands for stream editor and it can perform lot’s of function on file like, searching, find and replace, insertion or deletion.

The -n option asks sed to not display the regex or patten unless explicitly asked to do so. Try removing -n option and you will understand the difference:

display Lisa’s record.

sed -n '/Lisa/p' mysedfile

display both Tom’s and Lisa’s records.

sed -n '/Tom/p' mysedfile && sed -n '/Tom/p' mysedfile

I used && (or operator) to print both the lines

remove the blank line(s) from “mysedfile.”

sed -r '/^\s*$/d' mysedfile

replace all the digits with *.

sed 's/[0-9]/*/g' mysedfile

[0-9] will match all digits, and replace every single one with *

If you have any doubts, leave a comment below before rating. I'll be happy to assist you further.

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