Отображение доступной памяти на Linux/Ubuntu

Выполните в консоли команду.

user@home:~$ free -m
             total       used       free     shared    buffers     cached
Mem:          3920       2669       1250          0         76       1226
-/+ buffers/cache:       1367       2553
Swap:         4093          0       4093

ИЛИ

# cat /proc/meminfo
MemTotal:        4014516 kB
MemFree:         1466472 kB
Buffers:           76116 kB
Cached:          1026140 kB
SwapCached:            0 kB
Active:          1536520 kB
Inactive:         820268 kB
Active(anon):    1255464 kB
Inactive(anon):   127860 kB
Active(file):     281056 kB
Inactive(file):   692408 kB
Unevictable:          88 kB
Mlocked:              88 kB
SwapTotal:       4192252 kB
SwapFree:        4192252 kB
Dirty:              4276 kB
Writeback:             0 kB
AnonPages:       1254928 kB
Mapped:           164900 kB
Shmem:            128792 kB
Slab:              75096 kB
SReclaimable:      43516 kB
SUnreclaim:        31580 kB
KernelStack:        3752 kB
PageTables:        38476 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     6199508 kB
Committed_AS:    3750924 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      560444 kB
VmallocChunk:   34359174740 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:       63104 kB
DirectMap2M:     4096000 kB

Это работает на Debian, Ubuntu и RedHat.