Extrae las lineas entre dos palabras ingresadas entrepalabras.sh archivo.txt p1 p2

entre.sh

#! /bin/bash
archi=$1
t1=$2
t2=$3

linea=`grep -n "\[$2\]" $archi `
#separador
IFS=':'

# Read the split words into an array 
# based on space delimiter
read -ra newarr <<< "$linea"
nlinea="${newarr[0]}"

linea2=`grep -n "\[$3\]" $archi `
read -ra newarr <<< "$linea2"
nlinea2="${newarr[0]}"


#tail --lines=+$nlinea $1 |head -$nlinea2
cat $1 |sed -n "${nlinea},$((nlinea2-1))p"

ejemplo
entre.sh config.php OAI Proxy