Test and restart service with bash

Question

The goal of the script below is to test nginx configuration and if successful it will then restart the service as shown.

#!/bin/bash echo "checking nginx config..." if sudo nginx -t | grep -q 'successful'; then echo "restaring nginx..." sudo systemctl restart nginx fi

When this script is executed it prints

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok nginx: configuration file /etc/nginx/nginx.conf test is successful

However, I wonder why the statement inside the if-statement does not run even if the result text contains "successful"

maybe the string is printed on stderr? And why do you check for the string, wouldn't it be simpler to just if sudo nginx -t; then ? — KamilCuk
– KamilCuk, Commented Jun 15, 2019 at 15:55

Cyrus · Accepted Answer · 2019-06-15 15:55:28Z

1

Replace

nginx -t

with

nginx -t 2>&1

to wirte its stderr to stdout.

answered Jun 15, 2019 at 15:55

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