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    <p>This could give you your format:</p> <pre><code>#!/usr/bin/awk -f BEGIN { file1 = ARGV[1] file2 = ARGV[2] file3 = ARGV[3] getline &lt; file1 i = 0 while ((getline &lt; file1) &gt; 0) { r = $1 rollno_in_order[i++] = r t = $0 sub(/^[^[:blank:]]*[[:blank:]]*/, "", t) rollno_to_studentname[r] = t } getline &lt; file2 while ((getline &lt; file2) &gt; 0) { courseid = $1 t = $0 sub(/^[^[:blank:]]*[[:blank:]]*/, "", t) courseid_to_coursename[courseid] = t } i = 0 getline &lt; file3 while ((getline &lt; file3) &gt; 0) { i_to_courseid[i] = $2 i_to_grade[i] = $3 rollno_i_array[$1] = rollno_i_array[$1] i " " ++i } } END { for (i = 0; i in rollno_in_order; ++i) { r = rollno_in_order[i] printf("Roll No: %d\n", r) printf("Name: %s\n", rollno_to_studentname[r]) c = split(rollno_i_array[r], a, / */) for (j = 1; j &lt; c; ++j) { k = a[j] course_id = i_to_courseid[k] course_name = courseid_to_coursename[course_id] grade = i_to_grade[k] printf("CourseID: %s, CourseName: %s, Grade: %s\n", course_id, course_name, grade) | "sort" } close("sort") print "" } } </code></pre> <p>Running</p> <pre><code>awk -f script.awk -- file1 file2 file3 </code></pre> <p>Would give</p> <pre><code>Roll No: 1 Name: Student1 CourseID: BM13, CourseName: Linux, Grade: AB CourseID: CS11, CourseName: Discrete Mathematics, Grade: AB CourseID: CS12, CourseName: Business Communication, Grade: BC CourseID: MT15, CourseName: Business Management, Grade: BB Roll No: 2 Name: Student2 CourseID: BM13, CourseName: Linux, Grade: AB CourseID: CS11, CourseName: Discrete Mathematics, Grade: AA CourseID: CS12, CourseName: Business Communication, Grade: AA CourseID: MT15, CourseName: Business Management, Grade: AB Roll No: 3 Name: Student3 Roll No: 4 Name: Student4 </code></pre> <p>It's compatible with any standard awk.</p>
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    1. POUse Awk command to filter data from multiple tables
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    1. CO@vishalkin I hope you could try my script as well.
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    2. CORollNo:1 i.e Student1 should have only 4 CousreID,C_Name and Grade.. same for RollNo: 2
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    3. CO@vishalkin I see sorry about that. It's now fixed.
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