Shell Programming and Scripting

3 c C
5 e E
2 b B
1 a A
4 d D

echo "pls input the column number ->:"
read line
nawk -v l=$line '{
print $l}' a |sort  > b

1
2
3
4
5

1 frank 23
2 mary 43
3 jack 12
4 frank 55
5 frank 9
6 mary 12

there are 3 frank 
there are 2 mary 
there is 1 jack

cut -d"," -f2 filename > Cut_Column
sort -k2 Cut_Column >Result


awk '{
Count=0
getline Second_line
while ( $0 == Second_line )
count++
if ( $0 != Second_line)
print There are count $0
}' Result

{
  arr[$2]++
}
END {
  for(i in arr)
    printf("there %s %d %s\n", (arr[i]==1) ? "is" : "are", arr[i], i)
}

cat a | awk '
{
if (arr[$2]>=1)
	arr[$2]=arr[$2]+1
else
	arr[$2]=1
}
END{
for (i in arr)
printf("There are %s %s.\n",arr[i],i)}' | sort -k3 -r