The evil 203 in systemctl

As in the previous two examples , In execution systemctl Problems often occur when

for example

[[email protected] system]# systemctl status changeconfig.service -l
changeconfig.service - NIC Saver
   Loaded: loaded (/usr/lib/systemd/system/changeconfig.service; enabled)
   Active: failed (Result: exit-code) since Mon 2016-10-10 05:11:51 EDT; 1min 5s ago
  Process: 10949 ExecStart=/usr/bin/changename (code=exited, status=203/EXEC)
 Main PID: 10949 (code=exited, status=203/EXEC)

Oct 10 05:11:51 z.cent7 systemd[1]: Starting NIC Saver...
Oct 10 05:11:51 z.cent7 systemd[1]: changeconfig.service: main process exited, code=exited, status=203/EXEC
Oct 10 05:11:51 z.cent7 systemd[1]: Failed to start NIC Saver.
Oct 10 05:11:51 z.cent7 systemd[1]: Unit changeconfig.service entered failed state.

processing method :

/usr/bin/changename It is found that the following statement is omitted
#!/bin/sh

reason ：systemctl Executing a script requires confirmation of its interpreter .