1. cat-nginx

#!/bin/bash

_DEF="\x1b[0m"
_RED="\x1b[31m"
_GRN="\x1b[32m"
_ORG="\x1b[33m"
_BLU="\x1b[34m"
_MGT="\x1b[35m"
_CYN="\x1b[36m"

filename=$1
tempfile=$(mktemp)
cat "$filename" > "$tempfile"

# Colorize
sed -Ei 's/(server_name\s*)([a-z\.]+)(\s*;)/\1'"${_ORG}"'\2'"${_DEF}"'\3/g' "$tempfile"
sed -Ei 's/(listen[^0-9]+)([0-9]+)([^0-9]*)(;)/\1'"${_ORG}"'\2'"${_DEF}"'\3\4/g' "$tempfile"

sed -Ei 's/(root|index|server_name|location|include)\s/'"${_CYN}"'\1 '"${_DEF}"'/g' "$tempfile"
sed -Ei 's/(ssl_certificate|ssl_certificate_key|ssl_dhparam)\s/'"${_CYN}"'\1 '"${_DEF}"'/g' "$tempfile"

sed -Ei 's/(return|rewrite|proxy_pass|try_files)\s/'"${_RED}"'\1 '"${_DEF}"'/g' "$tempfile"
sed -Ei 's/(listen)\s/'"${_GRN}"'\1 '"${_DEF}"'/g' "$tempfile"
sed -Ei 's/(\$[a-zA-Z0-9_]+)([^a-zA-Z0-9_])/'"${_MGT}"'\1'"${_DEF}"'\2/g' "$tempfile"

#sed -Ei 's/([\{\}])/'"${_MGT}"'\1 '"${_DEF}"'/g' "$tempfile"

cat "$tempfile"
rm "$tempfile"

2. 예제 파일(test.conf)

server {
        listen 80 ;
        listen [::]:80 ;

        root /var/www/html;

        index index.html index.htm index.nginx-debian.html;

        server_name example.myserver.com;

        location / {
            try_files $uri $uri/ =404;
        }

        listen [::]:443 ssl ;
        listen 443 ssl;

        ssl_certificate /etc/letsencrypt/live/$server_name/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/$server_name/privkey.pem;
        include /etc/letsencrypt/options-ssl-nginx.conf;
        ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
}

3. 결과 예시

./cat-nginx test.conf