Where to look for /usr/bin/systemctl?

Question

linux

I wanted to hang an SSL certificate update on cron

30 2 * * 1 /opt/letsencrypt/letsencrypt-auto renew >> /var/log/le-renew.log
35 2 * * 1 /usr/bin/systemctl reload nginx

But I did not find a file or folder via FTP /usr/bin/systemctl

Answer 1

# which systemctl
or as a last resort
and why look for it via FTP?

Answer 2

which systemctl

Answer 3

1) Where is FTP configured?
2) Server management through systemd here will be all the answers