HackerRank Grep #1 problem solution

In this HackerRank Grep #1 problem solution In this challenge, we practice using the grep command to find specified strings or regular expressions.

Grep is a multi-purpose search tool that is used to find specified strings or regular expressions. A variety of options exist that makes it possible to use this command in several different ways and to handle many different situations. For example, one might opt for a case-insensitive search, or to display only the fragment matching the specified search pattern. The command could also be used to display only the line number of an input file where the specified string or regular expression has been found.

Task

You are given a text file that will be piped into your command through STDIN. Use grep to display all the lines that contain the word the in them. The search should be sensitive to case. Display only those lines of the input file that contain the word 'the'.

Input Format

A text file will be piped into your command through STDIN.

Output Format

Output only those lines that contain the word 'the'. The search should be case sensitive. The relative ordering of the lines in the output should be the same as it was in the input.

Problem solution.

grep -w 'the'

Second solution.

cat > f.txt
grep -i " the " f.txt

Third solution.

grep 'the ' /dev/stdin

Fourth solution.

cat | grep -w "the"