use this script to remove comment line in config file. e.g. $commentdel nginx.conf

commentdel

#!/bin/bash
#set -x

if [ $# -lt 1 ]; then
        echo "Usage: $0 < filepath > [ \# | \; | \/\/ | \<other comment sign>, default: \# ]"
        exit 1;
fi

CONFIG_FILE=$1
if [ ! -f ${CONFIG_FILE} ]; then
        echo "Error: File \"${CONFIG_FILE}\" not found."
        exit 1;
fi

if [ ! -z $2 ]; then
COMMENT_SING=$2
else
COMMENT_SING="#"
fi

egrep -v '^[[:space:]]*'${COMMENT_SING} ${CONFIG_FILE} | sed -e "/^$/d"