linux to clean up the system log

Cleaning system log TECHNOLOGY 
[the root @ izbp18dv3a3metugyd02qxz the httpd] # CD / var / log / TECHNOLOGY / 36dc953195bb4389870d2591ff6bfea5 
retain only the past week log journalctl --vacuum- Time =. 1 W 
[@ izbp18dv3a3metugyd02qxz the root 36dc953195bb4389870d2591ff6bfea5] # journalctl --vacuum- Time =. 1 w 
[root @ izbp18dv3a3metugyd02qxz 36dc953195bb4389870d2591ff6bfea5] # echo $? 
[root @ izbp18dv3a3metugyd02qxz 36dc953195bb4389870d2591ff6bfea5] # LL - H 
[root @ izbp18dv3a3metugyd02qxz 36dc953195bb4389870d2591ff6bfea5] # systemctl restart systemd -  journald.service
[root @ izbp18dv3a3metugyd02qxz 36dc953195bb4389870d2591ff6bfea5] # echo $?
[root@izbp18dv3a3metugyd02qxz 36dc953195bb4389870d2591ff6bfea5]# systemctl status systemd-journald.service
[root@izbp18dv3a3metugyd02qxz 36dc953195bb4389870d2591ff6bfea5]# systemctl status systemd-journald.service
● systemd-journald.service - Journal Service
   Loaded: loaded (/usr/lib/systemd/system/systemd-journald.service; static; vendor preset: disabled)
   Active: active (running) since Wed 2019-12-25 16:08:54 CST; 12s ago
     Docs: man:systemd-journald.service(8)
           man:journald.conf(5)
 Main PID: 5856 (systemd-journal)
   Status: "Processing requests..."
   CGroup: /system.slice/systemd-journald.service
           └─5856 /usr/lib/systemd/systemd-journald

[root@izbp18dv3a3metugyd02qxz 36dc953195bb4389870d2591ff6bfea5]# systemctl list-unit-files |grep journal
systemd-journal-catalog-update.service        static  
systemd-journal-flush.service                 static  
systemd-journald.service                      static  
systemd-journald.socket                       static 

[root@izbp18dv3a3metugyd02qxz 36dc953195bb4389870d2591ff6bfea5]# df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        7.5G     0  7.5G   0% /dev
tmpfs           7.6G     0  7.6G   0% /dev/shm
tmpfs           7.6G  648K  7.6G   1 % / run 
tmpfs           7 .6G      0   7 .6G    0 % / sys / fs / cgroup
 / dev / vda1 59G   7 .5G 49G   14 % / 
/ dev / vdb 985G 38G 897G    4 % / data 
tmpfs            1 .6G      0   1 .6G    0 % / run / user / 0