1. Using regular expressions with \'grep\' Download the GNU GPL License file fro

Question

1. Using regular expressions with 'grep'

Download the GNU GPL License file from: https://www.gnu.org/licenses/gpl-2.0.txt

Display the lines of that start with any Uppercase letter or a number. Then count the number of lines that end with the either a period, comma or semicolon.

Count the number of times the word free appears within the file then count the number of words that contain the word free.

Count the number of words that have a length of 8 and 12 characters long

2. File parsing with 'awk'

Download the csv from: http://archive.ics.uci.edu/ml/machine-learning-databases/00267/data_banknote_authentication.txt

Compute the average of the first four columns.

In the last column count the number occurrences of either 1 or 0.

I've never done scripting before and my professor is expecting us to learn how to script for our labs. Any help would be really appreciated

Explanation / Answer

Hi,

I could complete answer 1 only for the time allocated.

Ans 1-
a) Display the lines of that start with any Uppercase letter or a number.
sed -n '/^[A-Z0-9]/p'

b) Then count the number of lines that end with the either a period, comma or semicolon.
sed -n '/(;|.|,)+$/p'
c) Count the number of times the word free appears within the file then count the number of words that contain the word free
grep -o 'free' filename | wc -l

d) Count the number of words that have a length of 8 and 12 characters long

awk 'length($1) ==4 { print $1 }'

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