Shell Programming and Scripting

2000    3
1998    2
1997    2
1994    1
1991    1
1989    1
1987    2
1986    2
1985    1
1984    1
.
.
10      277256
9       278274
8       282507
7       284837
6       287066
5       292967
4       314583
3       342942
2       441704
1       487042

2000 110
1900 163
1800 139
.
.
.
200 3557341
100 13454579

awk '$1>=1901&&$1<=2000{total = total + $2}END{print total}' Input_File
110
awk '$1>=1801&&$1<=1900{total = total + $2}END{print total}' Input_File
163
awk '$1>=1701&&$1<=1800{total = total + $2}END{print total}' Input_File
139
awk '$1>=101&&$1<=200{total = total + $2}END{print total}' Input_File
3557341
awk '$1>=1&&$1<=100{total = total + $2}END{print total}' Input_File
13454579

awk '{X=sprintf("%i00",($1+99)/100);A[X]+=$2};END{for (i in A){print i,A[i]}}' file

awk '{X=sprintf("%i00",($1+49)/50);A[X]+=$2};END{for (i in A){print i/2,A[i]}}' Input_File

awk '{X=sprintf("%1.0d",($1+29)/30);A[X*30]+=$2};END{for (i in A){print i,A[i]}}' Input_File

awk -vRGE=30 '{X=sprintf("%1.0d",($1+(RGE-1))/RGE);A[X*RGE]+=$2};END{for (i in A){print i,A[i]}}' Input_File