I ran the 'systemctl status nagios -l' command. Below is the output
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systemctl status nagios -l
● nagios.service - Nagios Core 4.4.2
Loaded: loaded (/usr/lib/systemd/system/nagios.service; enabled; vendor preset: disabled)
Active: active (running) since Mon 2018-11-12 12:56:42 GMT; 3min 26s ago
Docs: https://www.nagios.org/documentation
Process: 7112 ExecStart=/usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg (code=exited, status=0/SUCCESS)
Process: 7110 ExecStartPre=/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg (code=exited, status=0/SUCCESS)
Main PID: 7114 (nagios)
CGroup: /system.slice/nagios.service
├─7114 /usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
├─7115 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─7117 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─7118 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
├─7119 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
└─7120 /usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
Nov 12 12:59:01 localhost.localdomain nagios[7114]: wproc: early_timeout=0; exited_ok=1; wait_status=32512; error_code=0;
Nov 12 12:59:01 localhost.localdomain nagios[7114]: wproc: stderr line 01: /bin/sh: /bin/mail: No such file or directory
Nov 12 12:59:01 localhost.localdomain nagios[7114]: wproc: stderr line 02: /usr/bin/printf: write error: Broken pipe
Nov 12 12:59:11 localhost.localdomain nagios[7114]: SERVICE ALERT: MobileIronDMZ;Total Processes;CRITICAL;SOFT;1;(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_nrpe, ...) failed. errno is 2: No such file or directory
Nov 12 13:00:01 localhost.localdomain nagios[7114]: SERVICE NOTIFICATION: nagiosadmin;HPBrocade781;Current Users;CRITICAL;notify-service-by-email;(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_nrpe, ...) failed. errno is 2: No such file or directory
Nov 12 13:00:01 localhost.localdomain nagios[7114]: wproc: NOTIFY job 4 from worker Core Worker 7117 is a non-check helper but exited with return code 127
Nov 12 13:00:01 localhost.localdomain nagios[7114]: wproc: host=HPBrocade781; service=Current Users; contact=nagiosadmin
Nov 12 13:00:01 localhost.localdomain nagios[7114]: wproc: early_timeout=0; exited_ok=1; wait_status=32512; error_code=0;
Nov 12 13:00:01 localhost.localdomain nagios[7114]: wproc: stderr line 01: /bin/sh: /bin/mail: No such file or directory
Nov 12 13:00:01 localhost.localdomain nagios[7114]: wproc: stderr line 02: /usr/bin/printf: write error: Broken pipe