Searching lines before & After in Unix

#! /usr/bin/sh
#———————————————–
#Program used to search a seed in a program
#———————————————–

SEED=$1
LINE=$2
FILE1=$3


for X in `awk '/'"$SEED"'/{ print NR }' $FILE1 `
do
echo ———————– $SEED ————————————–
NOB=`expr $X - $LINE`
NOA=`expr $X + $LINE`

if [ $NOB -lt 1 ]; then NOB=1
fi
for J in `awk 'NR == '"$NOB"',NR == '"$NOA"'
{
if(NF!=0) print; else print "\n"
}' $FILE1 `

do
echo $J
done
echo ——————————————————————-
done