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Display amount of free and used memory in the system In Ubuntu

By using free you can display amount of free and used memory in the system.
Free displays the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel. The shared memory
column should be ignored; it is obsolete.


free -m

Will display something like this:

             total       used       free     shared    buffers     cached
Mem: 244 240 3 0 15 82
-/+ buffers/cache: 143 101
Swap: 715 107 608


free [-b | -k | -m | -g] [-o] [-s delay ] [-t] [-V]


The -b switch displays the amount of memory in bytes; the -k switch
(set by default)
displays it in kilobytes; the -m switch displays it in megabytes;
the -g switch displays it in gigabytes.

The -t switch displays a line containing the totals.

The -o switch disables the display of a "buffer adjusted" line. If the
-o option is not
specified, free subtracts buffer memory from the used memory and
adds it to the free memory reported.

The -s switch activates continuous polling delay seconds apart. You may
actually specify
any floating point number for delay, usleep(3) is used for
microsecond resolution delay times.

The -V displays version information.


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