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Pure-FTPd: Yes, BSD License: Linux, BSD, macOS, and more Supports FXP. vsftpd: Yes, GPLv2 Linux, BSD, and more FTP, FTPS, FTPES. Supports X.509 client cert auth. deny / enable lists for user access. Logging data can be compatible with wu-ftpd format. vsftpd is default FTP daemon in Ubuntu, CentOS, Fedora, Slackware (along with ProFTPD), NimbleX ...
Pure-FTPd is a free (ISC license) FTP Server with a strong focus on software security. It can be compiled and run on a variety of Unix-like computer operating systems including Linux , OpenBSD , NetBSD , FreeBSD , DragonFly BSD , Solaris , Tru64 , Darwin , Irix and HP-UX .
ProFTPD (short for Pro FTP daemon) is an FTP server. ProFTPD is Free and open-source software, compatible with Unix-like systems and Microsoft Windows (via Cygwin).Along with vsftpd and Pure-FTPd, ProFTPD is among the most popular FTP servers in Unix-like environments today.
In July 2011, it was discovered that vsftpd version 2.3.4 downloadable from the master site had been compromised. [2] [3] Users logging into a compromised vsftpd-2.3.4 server may issue a ":)" smileyface as the username and gain a command shell on port 6200. [3]
In mathematical logic, a literal is an atomic formula (also known as an atom or prime formula) or its negation. [1] [2] The definition mostly appears in proof theory (of classical logic), e.g. in conjunctive normal form and the method of resolution. Literals can be divided into two types: [2] A positive literal is just an atom (e.g., ).
In thermodynamics, the phase rule is a general principle governing multi-component, multi-phase systems in thermodynamic equilibrium.For a system without chemical reactions, it relates the number of freely varying intensive properties (F) to the number of components (C), the number of phases (P), and number of ways of performing work on the system (N): [1] [2] [3]: 123–125
Fractionation at total reflux. The Fenske equation in continuous fractional distillation is an equation used for calculating the minimum number of theoretical plates required for the separation of a binary feed stream by a fractionation column that is being operated at total reflux (i.e., which means that no overhead product distillate is being withdrawn from the column).
The relative activity of a species i, denoted a i, is defined [4] [5] as: = where μ i is the (molar) chemical potential of the species i under the conditions of interest, μ o i is the (molar) chemical potential of that species under some defined set of standard conditions, R is the gas constant, T is the thermodynamic temperature and e is the exponential constant.