Red Hat Enterprise Linux 3: System Administration Guide
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# 42.2. Memory Usage

The `free` command displays the total amount of physical memory and swap space for the system as well as the amount of memory that is used, free, shared, in kernel buffers, and cached.

                 total       used       free     shared    buffers     cached
    Mem:        256812     240668      16144     105176      50520      81848
    -/+ buffers/cache:     108300     148512
    Swap:       265032        780     264252

The command `free -m` shows the same information in megabytes, which are easier to read.

                 total       used       free     shared    buffers     cached
    Mem:           250        235         15        102         49         79
    -/+ buffers/cache:        105        145
    Swap:          258          0        258

If prefer a graphical interface for `free`, you can use the GNOME System Monitor. To start it from the desktop, go to the Main Menu Button (on the Panel) => System Tools => System Monitor or type `gnome-system-monitor` at a shell prompt from within X Window System. Then choose the System Monitor tab.

Figure 42-2. GNOME System Monitor

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