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Note that if you use a Korn shell newer than the 1988 version, you can do this entirely in the shell. Just note that in awk the exponentiation operator is ^ but in ksh arithmetic expansions it is...

And since print is the default action, you can remove it too.
No need for quotes for a singe , in Filed Separator.

awk -F, '$1<=62 && $4=="M"' file

awk -F',' '$1<=62 && $4=="M" {print}' file

use -v option of awk to pass shell variables..

awk -F"," '{print $1" "$2}' cre|read var1 var2
echo $var1"\n"$var2 > ggh
awk -v v1=$var1 -v v2=$var2 'BEGIN {print...

Try:
awk '!a[$1]++||($2-old[$1] > 30){print}{old[$1]=$2}'Based on the logic you described, you are missing line
AN134 338 426496 1906 1 UNE Cefaclor in your sample output,...