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csgoserver || warning: command substitution: ignored null byte in input #934

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opened 2026-02-27 02:54:24 +03:00 by kerem · 6 comments

kerem commented

2026-02-27 02:54:24 +03:00

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Originally created by @thclaude on GitHub (Nov 23, 2016).
Original GitHub issue: https://github.com/GameServerManagers/LinuxGSM/issues/1199

Hi,

First of all, thanks for this amazing manager !

But I have one problem. The file 'csgoserver' in /var/mail is too heavy !!

When I take a look at this file, I can see manyyyy lines like this

/home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input

It's the same for /home/csgoserver/csgo4/ ; /home/csgoserver/csgo3/ etc etc..

And when i take a look at line 53 in monitor_gsquery.sh i found this :
gsquerycmd=$("${functionsdir}"/gsquery.py -a "${ip}" -p "${port}" -e "${engine}" 2>&1)

So there is any problem with this line ? And how can I fix that please ?

Thanks in advance !!

Originally created by @thclaude on GitHub (Nov 23, 2016). Original GitHub issue: https://github.com/GameServerManagers/LinuxGSM/issues/1199 Hi, First of all, thanks for this amazing manager ! But I have one problem. The file 'csgoserver' in /var/mail is too heavy !! When I take a look at this file, I can see manyyyy lines like this `/home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input /home/csgoserver/csgo5/lgsm/functions/monitor_gsquery.sh: line 53: warning: command substitution: ignored null byte in input` It's the same for /home/csgoserver/csgo4/ ; /home/csgoserver/csgo3/ etc etc.. And when i take a look at line 53 in monitor_gsquery.sh i found this : `gsquerycmd=$("${functionsdir}"/gsquery.py -a "${ip}" -p "${port}" -e "${engine}" 2>&1)` So there is any problem with this line ? And how can I fix that please ? Thanks in advance !!

kerem closed this issue

2026-02-27 02:54:25 +03:00

kerem commented

2026-02-27 02:54:25 +03:00

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@Dessa commented on GitHub (Nov 25, 2016):

thats bash 4.4.
im not exactly sure what triggers that exactly now.

@Dessa commented on GitHub (Nov 25, 2016): thats bash 4.4. im not exactly sure what triggers that exactly now.

kerem commented

2026-02-27 02:54:25 +03:00

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@UltimateByte commented on GitHub (Nov 26, 2016):

Things written to /var/mail/username are issues occuring for a given user. Here it seems like your system fails to set the variable properly for some reason.
I don't see any server info... Not even the distro version. How are we supposed to guess what the issue is ?
So if you wanna go further and hopefully get your issue solved, follow this "how to get help" guide https://github.com/GameServerManagers/LinuxGSM/wiki/Support
In addition, provide your bash version.

@UltimateByte commented on GitHub (Nov 26, 2016): Things written to /var/mail/username are issues occuring for a given user. Here it seems like your system fails to set the variable properly for some reason. I don't see any server info... Not even the distro version. How are we supposed to guess what the issue is ? So if you wanna go further and hopefully get your issue solved, follow this "how to get help" guide https://github.com/GameServerManagers/LinuxGSM/wiki/Support In addition, provide your bash version.

kerem commented

2026-02-27 02:54:25 +03:00

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@thclaude commented on GitHub (Nov 27, 2016):

Hi, sorry for forgetting details. I'll try to be more precise :

All of my servers are running CSGO
./csgoserver postdetails : http://hastebin.com/orevelahis
One exemple for the content of /var/mail/csgoserver : http://pastebin.com/7CD3mCZ7
Distro : Debian 7
lscpu : http://pastebin.com/axMiMuT0
Bash Version : GNU bash, version 4.4.5(1)-release (x86_64-pc-linux-gnu)

Hope this is precise.

@thclaude commented on GitHub (Nov 27, 2016): Hi, sorry for forgetting details. I'll try to be more precise : - All of my servers are running **CSGO** - ./csgoserver postdetails : http://hastebin.com/orevelahis - One exemple for the content of /var/mail/csgoserver : http://pastebin.com/7CD3mCZ7 - **Distro :** Debian 7 - **lscpu** : http://pastebin.com/axMiMuT0 - **Bash Version** : GNU bash, version 4.4.5(1)-release (x86_64-pc-linux-gnu) Hope this is precise.

kerem commented

2026-02-27 02:54:25 +03:00

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@UltimateByte commented on GitHub (Nov 28, 2016):

Thanks for providing more info We can go further then.

My bash version on Debian 8.6 is GNU bash, version 4.3.30(1)-release (x86_64-pc-linux-gnu)
Why would you have 4.4 ?
Oh... Debian GNU/Linux unstable (sid)
Well, i cannot recommend using unstable linux for production servers... As the name says, it's unstable and is probably the cause of the error that you see.
Uptime: 4d, 1h, 32m 4d uptime is an indicator of a user based issue.

After reviewing your log/mail example, my guess is that you're not redirecting output to /dev/null 2>&1 in your cronjobs which causes mails to be sent locally.
If you're unsure what i'm talking about with /dev/null, see this: https://github.com/GameServerManagers/LinuxGSM/wiki/Cronjobs

PS: if you have a FQDN, then your hostname should be a subdomain of this FQDN, not ns386298, and this subdomain should point to your server IP. Just for a matter of a good practice.

@UltimateByte commented on GitHub (Nov 28, 2016): Thanks for providing more info We can go further then. My bash version on Debian 8.6 is `GNU bash, version 4.3.30(1)-release (x86_64-pc-linux-gnu)` Why would you have 4.4 ? Oh... `Debian GNU/Linux unstable (sid)` Well, i cannot recommend using unstable linux for production servers... As the name says, it's unstable and is probably the cause of the error that you see. `Uptime: 4d, 1h, 32m` 4d uptime is an indicator of a user based issue. After reviewing your log/mail example, my guess is that you're not redirecting output to `/dev/null 2>&1` in your cronjobs which causes mails to be sent locally. If you're unsure what i'm talking about with /dev/null, see this: https://github.com/GameServerManagers/LinuxGSM/wiki/Cronjobs PS: if you have a FQDN, then your hostname should be a subdomain of this FQDN, not ns386298, and this subdomain should point to your server IP. Just for a matter of a good practice.

kerem commented

2026-02-27 02:54:25 +03:00

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@thclaude commented on GitHub (Nov 30, 2016):

I updated my distro and the problem is fixed now :)

Thanks for the answer !

@thclaude commented on GitHub (Nov 30, 2016): I updated my distro and the problem is fixed now :) Thanks for the answer !

kerem commented

2026-02-27 02:54:25 +03:00

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@lock[bot] commented on GitHub (Jul 19, 2018):

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

@lock[bot] commented on GitHub (Jul 19, 2018): This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

kerem referenced this issue

2026-02-27 03:53:40 +03:00

[PR #934] [MERGED] Starbound 1.0 Support #3207