How do I display the amount of free memory & swap on linux?

petulia3478

To display the amount free memory on linux run the following command:

In megabytes

# free -m
             total       used       free     shared    buffers     cached
Mem:         40220       9063      31156          0        375       7885
-/+ buffers/cache:        802      39417
Swap:        49999          0      49999

In gigabytes

# free -g
             total       used       free     shared    buffers     cached
Mem:            39          8         30          0          0          7
-/+ buffers/cache:          0         38
Swap:           48          0         48

In Kbytes

# free
             total       used       free     shared    buffers     cached
Mem:      41185340    9281256   31904084          0     384672    8075060
-/+ buffers/cache:     821524   40363816
Swap:     51199144          0   51199144

In blocks

# free -b
             total       used       free     shared    buffers     cached
Mem:    42173788160 9503875072 32669913088          0  393904128 8268861440
-/+ buffers/cache:  841109504 41332678656
Swap:   52427923456          0 52427923456