double variable substitution

[grub]

#shell script

cd1 = ENGR77 #environment variable
i=1 # local var

k="cd$i"
echo "$k"

Hi every one ... I wan't to print the value of 'k' as ENGR77.but i am getting the o/p
of 'k' as 'cd1'. the problem here is with the double variable substitution.
i have tried

eval echo $k
echo k=${cd$i}

here the 'cd1' is a global variable and 'i' local variable.i am using bash shell.

[signmem]

try
cd1=ENGR77
replace
cd1 = ENGR77 #environment variable

notice space not needed with "="

and

ooo=$"cd$1" means ooo=ENGR77