Change bash script interpreter

[EquIT]

Hello,

On my zabbix 6.0.4 (from VM appliance) I'm facing a problem with bash (.sh) scripts.

Scripts are in /opt/zabbix/scripts/ and have execution rights.
Here is the script :

#!/bin/bash
substring0="0"
substring1="1"
sortieCommande=$(./RequestToCrestron.sh $1 2>/dev/null)

echo -e "$sortieCommande"
sortieCommande=${sortieCommande##*+}
sortieCommande=${sortieCommande%-*}

echo "$sortieCommande"

if grep -q "$sortieCommande" <<< "$substring1";
then
echo 1
else
echo 0
fi

exit 0

Basically, the script ask via telnet the state of a meeting room to the controller and parse the response to give 1 or 0 as return.

The execution in command line as user zabbix work perfectly.

But when I ask to execute the script from zabbix web interface, it fail partially.
Factually, it seems to ignore language parts like if conditions (if is always true), or even variables are not usable.
Only the command echo 1 seems to work because this is the only output I have in web interface (even when the answer should be 0).

All that let me think it's a problem of bash interpreter, but I already adapted /etc/passwd file :
zabbix:x:997:994:Zabbix Monitoring System:/var/lib/zabbix:/bin/bash

How can I troubleshoot this problem and change the bash interpreter of the web interface itself ?

Thanks for your support.

EquIT

[cyber]

There is no "bash interpreter for the web interface" . It is still the same, what is given in script... That script is working in some server, so all the environment is there...
Maybe its the other script you are calling there?

[fvilarnovo]

As mentioned by cyber, there's no different interpreter. One thing that you could do, is to use print for the env variables to check the output just to be sure. Also, I've been pretty successful using TCL's expect for these kind of task with telnet:

https://wiki.tcl-lang.org/page/Expect+Examples

Good luck!

[Markku]

sortieCommande=$(./RequestToCrestron.sh $1 2>/dev/null)

Your script assumes that it will be run by Zabbix in the directory where RequestToCrestron.sh is. I'm not sure it is safe to assume anything about the currect directory. I'd recommend you to hard-code the path to that script here.

That would mean

sortieCommande=$(/opt/zabbix/scripts/RequestToCrestron.sh $1 2>/dev/null)

Markku