Linux command free

for Linux inside the free command to do a summary, well, in fact, the real reason is the recent interview repeatedly asked, and I know that is not very clear 650) this.width=650; "Src=" http://img.baidu.com/hi/ Jx2/j_0009.gif "alt=" J_0009.gif "/>

The free instruction shows memory usage, including physical memory, virtual swap file memory, shared memory segments, and buffers used by the system core.

First, free--help to view the optional parameters of the free command:

Usage:     free [options]        options :      -b, --bytes          // Display memory usage in bytes      -k, --kilo            //display memory usage in kilobytes      -m, --mega            //display memory usage in megabytes      -g, --giga            //display memory usage in megabytes           --tera                -o                   Do not display buffer throttling columns (centos7.2 has this option)      -h, --human             //output in human-readable form (i.e. with units)          --si               //used in 1000 instead of 1024      -l, --lohi            // Displays detailed low-and high-memory statistics      -t, --total            //Show Total Memory      -s N, --seconds N      //< interval seconds >   continuous observation of memory usage      -c n, --count n        //observe memory usage for each second in the next n seconds      -v, -- version        //displaying version information

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Linux command free