How do i write a shell script for checking website live or not

Question

I am writing a shell script to monitor website live or not and send an email alert below is my code ``` #!/bin/bash if [[ curl -s --head --request GET http://opx.com/opx/version | grep "200 OK" > /dev/null] && [ curl -s --head --request GET http://oss.com/version | grep "200 OK" > /dev/null ]] then echo "The HTTP server on opx.com and oss.com is up!" #> /dev/null else msg="The HTTP server opx.com Or oss.com is down " email="opx-noc@opx.com" curl --data "body=$msg &to=$email &subject=$msg" https://opx.com/email/send fi; ``` if i run this code i got ``` ./Monitoring_Opx_Oss: line 2: conditional binary operator expected ./Monitoring_Opx_Oss: line 2: syntax error near `-s' ./Monitoring_Opx_Oss: line 2: `if [[ curl -s --head --request GET http://opx.com/opx/version | grep "200 OK" > /dev/null] && [ curl -s --head --request GET http://oss.com/version | grep "200 OK" > /dev/null ]] ' ``` Please correct me...

Accepted Answer

Change it do this:

```
if [ $(curl -s --head  --request GET http://opx.opera.com/opx/version | grep "200 OK" > /dev/null) ] && [ $(curl -s --head --request GET http://oss.opera.com/version | grep "200 OK" > /dev/null) ]
```

To check the status of a command inside an `if`, you have to do it like

```
if [ $(command) ]
```

while you were using

```
if [ command]
```

note also the need of spaces around `[ ]`: `if [_space_ command _space_ ]`

Update

Based on Ansgar Wiechers's comment, you can also use the following:

```
if curl -s --head  --request GET http://opx.com/opx/version | grep "200 OK" > /dev/null && curl -s --head --request GET http://oss.com/version | grep "200 OK" > /dev/null;
```

That is,

```
if command && command
```

How do i write a shell script for checking website live or not

Solution

Problem