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For above case, we can use a variable and pass it to awk.

nawk -v a=10 'BEGIN{print a}'

Hi,

I think this one can help you.
input:
a:
this,is
this,is
this,is
b:
first
second
third
code:
awk 'BEGIN{FS=","}
{
if (NF==1)
hou[NR]=$0
if (NF>1)
qian[NR-3]=$0
}