[asdfxD]

create .txt files in your steam dir for every server you are runing.

update27015.txt, update27115.txt, update27215.txt

add inside the .txt

@ShutdownOnFailedCommand 1
@NoPromptForPassword 1
login anonymous
force_install_dir /home/gameserver/csgo27015
app_update 740
quit

add this to your commandline:

-autoupdate -steam_dir /home/steamcmd -steamcmd_script /home/steamcmd/update27015.txt

the server will auto update if there is an cs go update, the paths are an example.

or use a script like ./srcds-update.sh and set a cronjob every day.

srcds-update.sh:

#!/bin/bash
cd /home/steamcmd
./steamcmd.sh +runscript srcds-update.txt

srcds-update.txt:

@ShutdownOnFailedCommand 1
@NoPromptForPassword 1
login anonymous
force_install_dir /home/gameserver/csgo27015
app_update 740
force_install_dir /home/gameserver/csgo27115
app_update 740
quit

cronjob

5 00 * * * /home/srcds-update.sh

dont think there is a other way to do this. csgo server launcher/opengamepanel do the same and use -autoupdate function.