How to replace the word “Gun” with “Pen” in the first 100 lines of a file?

How do you remove the first number on 10th line in file?

sed ’10 s/[0-9][0-9]*//’ < filename

Write a command to find the number of files in a directory

ls -l|grep ‘^-‘|wc -l

How to display the first 20 lines of a file?

By default, the head command displays the first 10 lines from a file. If we change the option of head, then we can display as many lines as we want. head -20 filename An alternative solution is using the sed command sed ’21,$ d’ filename The d option here deletes the lines from 21 to […]