How Many Gigs of RAM Are On My Server?

How much memory is on my linux server? Run the free command

free -g
 total used free shared buffers cached
Mem: 2 1 0 0 0 1
-/+ buffers/cache: 0 1
Swap: 3 0 3

Which will tell you memory in Gigs. You can pass other flags, such as, -m or -k, which will give you the number in megs and kilobytes respectively. The man page is as follows

man free

FREE(1) Linux User's Manual FREE(1)

NAME
       free - Display amount of free and used memory in the system

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

DESCRIPTION
       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       ignored; it is obsolete.

   Options
       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 resolu-
       tion delay times.

       The -V displays version information.

FILES
       /proc/meminfo
              memory information

SEE ALSO
       ps(1), slabtop(1), vmstat(8), top(1)

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