Freebsd – How to create /dev/null on BSD

mknod /dev/null c 1 3
chmod 666 /dev/null

Use these command to create /dev/null or use null(4) manpage for further help.

For simple free/active figures, I've always used vmstat:

~ # vmstat
procs  memory       page                    disks     faults         cpu
r b w  avm   fre   flt  re  pi  po    fr   sr da0 cd0   in    sy    cs us sy id
1 0 2 841M   89M    23   0   0   0    29    9   0   0    4   110    93  0  0 100

From the man page:

Information about the usage of virtual and real memory. Virtual pages (reported in units of 1024 bytes) are considered active if they belong to processes which are running or have run in the last 20 seconds.

         avm     active virtual pages
         fre     size of the free list

For information on swap usage:

~ # swapinfo -h
Device          1K-blocks     Used    Avail Capacity
/dev/da0p2        2097152      25M     2.0G     1%