Linux is one of the most popular open source operating system and comes with huge set of commands. The most important and single way of determining the total available space of the physical memory and swap memory is by using “free” command.
The Linux “free” command gives information about total used and available space of physical memory and swap memory with buffers used by kernel in Linux/Unix like operating systems.
This article provides some useful examples of “free” commands with options, that might be useful for you to better utilize memory that you have.
1. Display System Memory
Free command used to check the used and available space of physical memory and swap memory in KB. See the command in action below.# free total used free shared buffers cached Mem: 1021628 912548 109080 0 120368 655548 -/+ buffers/cache: 136632 884996 Swap: 4194296 0 4194296
# free -b total used free shared buffers cached Mem: 1046147072 934420480 111726592 0 123256832 671281152 -/+ buffers/cache: 139882496 906264576 Swap: 4294959104 0 4294959104
# free -k total used free shared buffers cached Mem: 1021628 912520 109108 0 120368 655548 -/+ buffers/cache: 136604 885024 Swap: 4194296 0 4194296
# free -m total used free shared buffers cached Mem: 997 891 106 0 117 640 -/+ buffers/cache: 133 864 Swap: 4095 0 4095
# free -g total used free shared buffers cached Mem: 0 0 0 0 0 0 -/+ buffers/cache: 0 0 Swap: 3 0 3
# free -t total used free shared buffers cached Mem: 1021628 912520 109108 0 120368 655548 -/+ buffers/cache: 136604 885024 Swap: 4194296 0 4194296 Total: 5215924 912520 4303404
# free -o total used free shared buffers cached Mem: 1021628 912520 109108 0 120368 655548 Swap: 4194296 0 4194296
# free -s 5 total used free shared buffers cached Mem: 1021628 912368 109260 0 120368 655548 -/+ buffers/cache: 136452 885176 Swap: 4194296 0 4194296
# free -l total used free shared buffers cached Mem: 1021628 912368 109260 0 120368 655548 Low: 890036 789064 100972 High: 131592 123304 8288 -/+ buffers/cache: 136452 885176 Swap: 4194296 0 4194296
# free -V procps version 3.2.8
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