Shell Programming and Scripting

Sample
1
2
2
3
4
1
1
1
2

sort 1.txt |uniq -c |sort |tail -1 |awk '{print $2}'

cat test_st
1 2 3
2 4 5
2 3 5
3 4 9
4 7 5
1 5 6
1 4 5
1 4 2
2 5 5

for i in {1..3}
do
echo -e "i == $i\n"
cat test_st | awk -v L=$i '{ print $L }' | sort | uniq -c | sort -nrk1 | head -1 | awk '{ print $2 }'
done

i == 1

1
i == 2

4
i == 3

5

tr '\n' ' '

$ cat 1.txt
Sample
1
2
2
3
4
1
1
1
2

$ awk '{a[$1]++}END{for(i in a)if(a[i]>x)x=a[i];for(i in a)if(a[i]==x)print i}' 1.txt
1

$

$ echo 2 >> 1.txt

$ awk '{a[$1]++}END{for(i in a)if(a[i]>x)x=a[i];for(i in a)if(a[i]==x)print i}' 1.txt
1
2

$

$ cat 1.txt
5,3,2,6
4,4,3,2
4,1,2,3
4,1,2,3
3,5,2,3

$ awk ' BEGIN { FS=OFS="," }
      { for (n = 1; n <= NF; n++) { a[n, $n]++ } }
  END { for (n = 1; n <= NF; n++) {
          x = 0
          for (i in a) {
            split(i, s, SUBSEP)
            if (s[1] == n && a[i] > x) {
              x = a[i]
              y = s[2]
            }
          }
          printf y (n==NF ? ORS : OFS)
        }
      } ' 1.txt > 2.txt

$ cat 2.txt
4,1,2,3

$