Making multi line output appear on one line

Shell Programming and Scripting
1

Basically I wanna take grep output,

EACH_OPTION_CHARGE: V033*, VMVM, 4.00, M
EACH_OPTION_CHARGE: V040*, VMVM, 4.00, M
EACH_OPTION_CHARGE: V042*, VMVM, 4.50, M
EACH_OPTION_CHARGE: V043*, VMVM, 5.00, M
EACH_OPTION_CHARGE: V050*, VMVM, 4.00, M
EACH_OPTION_CHARGE: V052*, VMVM, 4.50, M

and get the following.

V033,V040,V042,V043,V050,V052

Basically, I am familair enough with awk to strip everything else out other then what I need, but I dont know how to get it all on one line.... any help will be apprecialted!

2

try:

grep 'EACH_OPTION' testfile | awk '
  {printf "%s, " ,substr($2,1,4)} END {printf "\n"}'