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thanks for that,i tried all this while to understand the idea. still coudnt

hi Friends
need to compare columns in one file where the data looks like below
laptop,IBM
phone,samsung
car,rental
user1,laptop
user2,laptop
user3,phone

want to get output as
laptop,IBM...

hi All,
need help. have a file like below
A, error in 123
B, log files are present
A, error in 23444
B, log files are present
A, move to next line
C, matching messages

-- expected output--...

hi All, is there a way in linux to loop thru all variables sourced?
i have a set configs like
A=100
b=200
c=400
i can add the above lines to a file and source - so that $A will be 100 .. like...