In mathematics, a semigroup is an algebraic structure consisting of a
set together with an associative binary operation. A semigroup
generalizes a monoid in that there might not exist an identity element.
It also (originally) generalized a group (a monoid with all inverses) to
a type where every element did not have to have an inverse, thus the
name semigroup.
Plugdaemon acts as a "dumb proxy", forwarding a TCP/IP stream from a port
on one host to a possibly different port on a separate host. It runs as a
daemon to reduce latency in setting up a connection, and optionally logs
every connection via syslog.
wping is a Web-based graphical ping log. It logs ping response times to a
user-defined list of hosts and produces a Web page that contains a current
ping graph and a historic ping graph over a specified time period. Ping
response times are averaged in order to give a smooth reading.
FreeBSD Port 工具包含下面的命令:
- port 创建:从模版创建新的 port
- port 差异对比:根据之前的版本生成 port 的差异
- port 抓取:抓取 port 的新版本的 distfile(s)
- port 帮助:显示 port(1) 命令的用法概要
- port 提交:提交新的 port 或者 port 修改/更新的 PR
- port 测试:自动测试新的 port 或者 port 更新
Gnome Chemistry Utils provide C++ classes and Gtk+-2 widgets related
to chemistry. It also contains these programs:
* GChemPaint: a 2D chemical editor
* a chemical calculator
* a molecular structure viewer (GChem3D)
* a crystal structure viewer and editor (Gnome Crystal)
* a periodic table of the elements
* a Mozilla plugin (which displays only XYZ files at the moment)
* a simple spectrum viewer (GSpectrum)
* What MBDyn is
o a command-line, direct initial-value problem solver
with a large, flexible multifield element library
o a research tool
o a community developed, research driven open-source software
* What MBDyn is not
o a complete out-of-the-box ``bells and whistles'' GUI for solid modeling
o a commercial tool
o a completely supported software
Lsof (LiSt Open Files) lists information about files that are open by the
running processes. An open file may be a regular file, a directory, a block
special file, a character special file, an executing text reference, a
library, a stream or a network file (Internet socket, NFS file or Unix domain
socket).
See also fstat(1) in the base system.
A priority search queue efficiently supports the opperations of both a
search tree and a priority queue. A 'Binding' is a product of a key and
a priority. Bindings can be inserted, deleted, modified and queried in
logarithmic time, and the binding with the least priority can be
retrieved in constant time. A queue can be built from a list of
bindings, sorted by keys, in linear time.
gxmms2 is a GTK2 based XMMS2 client, written in C. Its main window is small and
simple. It includes a playlist editor and a file details dialog.
This is a port of Nosefart, a player for the NSF sound format, which
describes music taken from Nintendo Entertainment System game cartridges
in a compact form.