To find out a directory size in Linux

sudo du -sh /path/to/folder

Network Configuration in OpenBSD

Edit /etc/rc.conf

Change

ifconfig_em0="DHCP"

to

ifconfig_em0="inet 192.168.56.105 netmask 255.255.25.0"

and add

defaultrouter="192.168.56.1"

edit /etc/resolve.conf as per Linux and then do;

service netif restart && service routing restart

[source]

Ping on OpenVMS

 UCX PING xxx.xxx.xxx.xxx