I want to grep an environment variable

env | grep ABC_IJK[1,2]

currenlty defined variables are like this

ABC_IJK1=123
ABC_IJK1_XYZ=sn123:345
ABC_IJK2=999
ABC_IJK2_XYZ=sn321:999

I only want to get only this

ABC_IJK1=123
ABC_IJK2=999

get number of connections sum them(not 123 + 999) and save in N1 (this one has 2 connection)

so N1=2

get number of connections sum them and save in N2 for other machine (if this have four)

so N2=4

If the value is not there or the variable is not present then N1=1 for below:

ABC_IJK1=
ABC_IJK2=123

Then need to compare it with a MAX_CONNECTION variable

Thanks