Dit is de output van het free commando (een perl script voor freebsd):

[root@s01 ~]# free
SYSTEM MEMORY INFORMATION:
mem_wire: 259895296 ( 247MB) [ 12%] Wired: disabled for paging out
mem_active: + 581406720 ( 554MB) [ 27%] Active: recently referenced
mem_inactive:+ 1147559936 ( 1094MB) [ 54%] Inactive: recently not referenced
mem_cache: + 84426752 ( 80MB) [ 4%] Cached: almost avail. for allocation
mem_free: + 25907200 ( 24MB) [ 1%] Free: fully available for allocation
mem_gap_vm: + 614400 ( 0MB) [ 0%] Memory gap: UNKNOWN
-------------- ------------ ----------- ------
mem_all: = 2099810304 ( 2002MB) [100%] Total real memory managed
mem_gap_sys: + 38064128 ( 36MB) Memory gap: Kernel?!
-------------- ------------ -----------
mem_phys: = 2137874432 ( 2038MB) Total real memory available
mem_gap_hw: + 9609216 ( 9MB) Memory gap: Segment Mappings?!
-------------- ------------ -----------
mem_hw: = 2147483648 ( 2048MB) Total real memory installed

SYSTEM MEMORY SUMMARY:
mem_used: 889589760 ( 848MB) [ 41%] Logically used memory
mem_avail: + 1257893888 ( 1199MB) [ 58%] Logically available memory
-------------- ------------ ----------- ------
mem_total: = 2147483648 ( 2048MB) [100%] Logically total memory