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Suse openSUSE 12.2 Manual

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IMPORTANT
Not all shells support ulimit directives. PAM (for instance, pam_limits)
offers comprehensive adjustment possibilities if you depend on encompassing
settings for these restrictions.
11.1.6 The free Command
The free command displays the total amount of free and used physical memory and
swap space in the system, as well as the buffers and cache consumed by the kernel. The
concept of available RAM dates back to before the days of unied memory management.
The slogan free memory is bad memory applies well to Linux. As a result, Linux has
always made the effort to balance out caches without actually allowing free or unused
memory.
Basically, the kernel does not have direct knowledge of any applications or user data.
Instead, it manages applications and user data in a page cache. If memory runs short,
parts of it are written to the swap partition or to les, from which they can initially be
read with the help of the mmap command (see man mmap).
The kernel also contains other caches, such as the slab cache, where the caches used
for network access are stored. This may explain the differences between the counters
in /proc/meminfo. Most, but not all, of them can be accessed via /proc/
slabinfo.
However, if your goal is to nd out how much RAM is currently being used, nd this
information in /proc/meminfo.
11.1.7 Man Pages and Info Pages
For some GNU applications (such as tar), the man pages are no longer maintained. For
these commands, use the --help option to get a quick overview of the info pages,
which provide more in-depth instructions. Info is GNU's hypertext system. Read an
introduction to this system by entering info info. Info pages can be viewed with
Emacs by entering emacs -f info or directly in a console with info. You can
also use tkinfo, xinfo or the help system to view info pages.
198 Reference
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