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129 lines
5.0 KiB
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10 ‘free’ Commands to Check Memory Usage in Linux
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**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.
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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.
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This article provides some useful examples of “**free**” commands with options, that might be useful for you to better utilize memory that you have.
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### 1. Display System Memory ###
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Free command used to check the used and available space of **physical memory** and **swap memory** in **KB**. See the command in action below.
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# free
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total used free shared buffers cached
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Mem: 1021628 912548 109080 0 120368 655548
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-/+ buffers/cache: 136632 884996
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Swap: 4194296 0 4194296
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### 2. Display Memory in Bytes ###
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Free command with option **-b**, display the size of memory in **Bytes**.
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# free -b
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total used free shared buffers cached
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Mem: 1046147072 934420480 111726592 0 123256832 671281152
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-/+ buffers/cache: 139882496 906264576
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Swap: 4294959104 0 4294959104
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### 3. Display Memory in Kilo Bytes ###
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Free command with option **-k**, display the size of memory in (KB) **Kilobytes**.
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# free -k
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total used free shared buffers cached
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Mem: 1021628 912520 109108 0 120368 655548
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-/+ buffers/cache: 136604 885024
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Swap: 4194296 0 4194296
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### 4. Display Memory in Megabytes ###
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To see the size of the memory in **(MB) Megabytes** use option as **-m**.
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# free -m
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total used free shared buffers cached
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Mem: 997 891 106 0 117 640
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-/+ buffers/cache: 133 864
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Swap: 4095 0 4095
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### 5. Display Memory in Gigabytes ###
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Using **-g** option with free command, would display the size of the memory in **GB(Gigabytes)**.
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# free -g
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total used free shared buffers cached
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Mem: 0 0 0 0 0 0
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-/+ buffers/cache: 0 0
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Swap: 3 0 3
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### 6. Display Total Line ###
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Free command with -t option, will list the total line at the end.
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# free -t
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total used free shared buffers cached
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Mem: 1021628 912520 109108 0 120368 655548
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-/+ buffers/cache: 136604 885024
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Swap: 4194296 0 4194296
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Total: 5215924 912520 4303404
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### 7. Disable Display of Buffer Adjusted Line ###
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By default the free command display “**buffer adjusted**” line, to disable this line use option as -o.
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# free -o
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total used free shared buffers cached
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Mem: 1021628 912520 109108 0 120368 655548
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Swap: 4194296 0 4194296
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### 8. Dispaly Memory Status for Regular Intervals ###
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The -s option with number, used to update free command at regular intervals. For example, the below command will update free command every 5 seconds.
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# free -s 5
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total used free shared buffers cached
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Mem: 1021628 912368 109260 0 120368 655548
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-/+ buffers/cache: 136452 885176
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Swap: 4194296 0 4194296
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### 9. Show Low and High Memory Statistics ###
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The -l switch displays detailed high and low memory size statistics.
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# free -l
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total used free shared buffers cached
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Mem: 1021628 912368 109260 0 120368 655548
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Low: 890036 789064 100972
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High: 131592 123304 8288
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-/+ buffers/cache: 136452 885176
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Swap: 4194296 0 4194296
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### 10. Check Free Version ###
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The -V option, display free command version information.
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# free -V
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procps version 3.2.8
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--------------------------------------------------------------------------------
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via: http://www.tecmint.com/check-memory-usage-in-linux/
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作者：[Ravi Saive][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://www.tecmint.com/author/admin/ |