Shell Programming and Scripting

2
5
120
208
7
28
45
6
33
120
7
208
so onn..

awk '{count[$1]++}END{for(j in count) print j,"- "count[j]""}' yourfile.txt

 
awk '{
 c[$1]++; 
 if($1 < min) min=$1; 
 if($1 > max) max=$1;
}END{
  for(i=min; i<=max; i++){
     print i "-" (c[i]?c[i]:0) }
}' freqData.txt

awk 'BEGIN{max=0}{
c[$1]++;
if($1 > max){max=$1}
}
END{for(i=0;i<=max;i++)
	{ print i"-"(c[i]?c[i]:0)
	}
}' filename

sort -n filename|uniq -c