HackerRank Awk - 1 problem solution

In this HackerRank Awk - 1 problem solution In this challenge, we practice using the awk command for text-munging and data processing tasks. The awk interpreter may be used for a lot of text-munging and data-processing tasks that require some quick scripting work.

Task

You are given a file with four space-separated columns containing the scores of students in three subjects. The first column contains a single character (A-Z), the student identifier. The next three columns have three numbers each. The numbers are between 0 and 100, both inclusive. These numbers denote the scores of the students in English, Mathematics, and Science, respectively.

Your task is to identify those lines that do not contain all three scores for students.

Input Format

There will be no more than 10 rows of data.

Each line will be in the following format:

[Identifier][English Score][Math Score][Science Score]

Output Format

For each student, if one or more of the three scores is missing, display:

Not all scores are available for [Identifier]

Problem solution.

awk '{
if ($2 == "" || $3 == "" || $4 == "")
  print "Not all scores are available for",$1,"";
}'

Second solution.

awk '{if (NF == 3) {print "Not all scores are available for "$1}}'

Third solution.

awk '{
if (NF<4)
    print ("Not all scores are available for",$1);
    }'