String manipulation

Question 1

List line numbers

Answer 1

nl /etc/autofs.conf

Question 2

scroll 6 line numbers from 13th line of a file

Answer 2

tail -n+13 /etc/autofs.conf | head -n 6

Question 3

Find particular type

Answer 3

find / -type f -name apache

Question 4

Replace string globally

Answer 4

sed s/mysql/MySQL/g /etc/snort/snort.conf > snort2.conf

Question 5

Replace once

Answer 5

sed s/mysql/MySQL/ snort.conf > snort2.conf

Question 6

Replace only first 2 occurrence

Answer 6

sed s/mysql/MySQL/2 snort.conf > snort2.conf