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Hello Jassi,

Not sure about your logic but as per your output following may help you in same.

awk -vone=1 -vtwo=2 -vthree=3 -F, '{for(i=1;i<=NF;i++){A=i%3==0?A ORS $i one ORS $i two ORS $i...

Any attempt from your side?

---------- Post updated at 20:45 ---------- Previous update was at 20:44 ----------

Howsoever, try
awk 'NF {TMP=TMP $0; next} {print TMP ";"; TMP=""} END {print TMP...

You could also try:
awk '{printf("%s", NF ? $0 : ";\n")}END{print ";"}' file

You may also try

[akshay@localhost tmp]$ cat file
ABC
DEF
GHI
JKL

MNO
PQR
STU
VWX

YZA
[akshay@localhost tmp]$ awk '!NF{print ";\n"}END{print ";\n"}1' ORS="" file
ABCDEFGHIJKL;...