Linux Review

Source:
GNU cluster: debian, ubuntu; redhat, fedora
or Enterprise Edition.
Linux Kernel: kernel.org
Desktop: Gnome, KDE
Hardware: kernel, X,

Admin related:
1. ps ax | grep firefox; kill UID
2. wget url;
3. apt for rpm(synaptic) and yum if using the fedora environment.
== fileS or packageS from the distribution or the 3rd.
4. directory: kernel modules.

Programming
unistd.h..
why pipe?Personally,
pipe 'file' only lies in memory. and inspired from the block/character device's operation, the pipe can provide support for the large file's or basic file's streamlined operation. as a long-history IPC way, Its existence show the power and conveniences just like the data structure of stack or queue, to some extends. it's "the queue in Disk".