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thats right its not just for case change but for any pattern change

i tried but no output at all and also can u tell what does :a, $, N;b mean
thank u

i tried but not even one replacement did occur
let me tell my que once again
a file say 'x' with contents
hello
unix
hello
hello


after sed cmd execution i want the output as
HELLO...

hi
how can we change only the first ocurrence of a pattern using sed
thank u