How To Add Rows with same values in LINUX

How To Add Rows with same values in LINUX

Consider a output of your command is as below

a 10
b 20
c 23
a 85
c 73
b 111
d 69
d 88
b 94
c 33
a 61

I want to add all a,b,c and d value

# cat list | awk '{ a[$1]+= $2 }END { for (i in a) print i,a[i]}'

OUTPUT

a 156
b 225
c 129
d 157