Steps to reproduce:

• download and install agent for macOS
  • https://www.zabbix.com/downloads/5.0.2/zabbix_agent-5.0.2-macos-amd64-openssl.pkg
  • macOS 10.15.6
• configure agent
  • Server=127.0.0.1, 10.0.0.0/24
    ServerActive=127.0.0.1, 10.0.0.0/24
    Hostname=mymac
    Include=/usr/local/etc/zabbix/zabbix_agentd.conf.d/*.conf
• add custom parameter, e.g. simple test:
  • /usr/local/etc/zabbix/zabbix_agentd.conf.d/userparameter_examples.conf
    • UserParameter=system.test,echo mytest
  • or e.g. the default postgresql and mysql custom parameters
• run agent
  • zabbix_agentd -f
• default item works fine, e.g.
  • zabbix_get -s 10.0.0.10 -k "system.cpu.load[all,avg1]"
• custom parameter gives error and value (in Zabbix server, and when manually using zabbix_get), e.g.
  • zabbix_get -s 10.0.0.10 -k "system.test"
  • (running this command from same system as agent, or different system - the outcome is identical)

Output: error and value are shown

shell-init: error retrieving current directory: getcwd: cannot access parent directories: No such file or directory
mytest

Zabbix server stores the "shell-init" error instead of the value(s).