[[Interface::command-line]]

Cryptmount: cryptmount assists system administrators in setting up encrypted filesystems based on the device mapper (dm-crypt) of GNU/Linux systems using a 2.6-series kernel. After initial setup, it allows any user to mount or unmount filesystems on demand, solely by providing the decryption password, with any system devices needed to access the filing system being configured automatically. A wide variety of encryption schemes (provided by the kernel and libgcrypt library) can be used to protect both the filing system and the access key. The protected filing systems can reside in either ordinary files or disk partitions.

CryptoTools: Set of multiplatform cryptographic-related applications to be run from batch, console or GUI, without installation.
- fmac: calculate Message Autentication Code using TEA and XTEA in OMAC mode
- fsaber: encrypt/decrypt files, compatible with classic CipherSaber-1 and -2, features also a secure deletion mode
- fstegano: simple steganographic tool to hide/extract a file in less significant bits of another file

Cspeedtest: Command line (CLI) network speed test for GNU/Linux servers, using libncurses to estimate network throughput between you and your server over an existing ssh connection. Works on any client platform that has a terminal that supports curses (e.g. iOS, Android, Mac OS, Windows, GNU/Linux, etc). Network speed is measured by writing screenfuls of random characters to the terminal, using the resulting framerate to estimate the throughput. It takes advantage of the implicit communication between the server and your terminal to measure network performance without any client software beyond the terminal you already have. Note: This software just needs to be installed on the server.

Cssc: CSSC is the GNU project's replacement for the traditional Unix SCCS suite. It aims for full compatibility (including precise nuances of behaviour, support for all command-line options, and in most cases bug-for-bug compatibility) and comes with an extensive automated test suite. If you currently use SCCS for version control, you should be able to just drop in CSSC, even if you have a large number of shell scripts which are layered on top of SCCS and depend on it. This will let you to develop on and for GNU/Linux if your source code exists only in an SCCS repository. CSSC also lets you migrate to a more modern version control system.

Cssmerge: 'cssmerge' extracts selected blocks of CSS from input stylesheets, and merges them into a single coherent output stylesheet, with optional comments on where they came from, and warnings about conflicting styles. Whole blocks can be chosen by selector or partial blocks which contain a particular property may be generated. You can match selectors completely or by element, class, or ID; properties can be matched completely or partially. The output is a valid CSS file, sorted to make it easy to find what you are looking for.

Csv2latex: 'csv2latex' is a file format converter that converts a well formed CSV file (like the ones exported from OpenOffice.org) to the LaTeX document format.

CsvCat: Read multiple comma separated value files, such as exported from a spreadsheet or a database, and combine the output into a single file. Options are available to limit the columns included and to semi-intelligently skip headers.

CsvUtils: Transformation utilities for csv (or csv-like) generated rows. The standard csv module is very useful for parsing tabular data in CSV format. Typically though, one or more transformations need to be applied to the generated rows before being ready to be used; for instance "convert the 3rd column to int, the 5th to float and ignore all the rest". This module provides an easy way to specify such transformations upfront instead of coding them every time by hand. Two classes are currently available, SequenceTransformer and MappingTransformer, that represent each row as a list (like csv.reader) or dict (like csv.DictReader), respectively.

Ctags: Exuberant Ctags is a multilanguage reimplementation of the *nix ctags program. It generates an index of source code object definitions which editors and tools use to instantly locate the definitions. Exuberant Ctags currently supports 41 different computer languages.

Ctools: ctools is a set of useful tools for C programs including a resource database, a tiny interpreter, a set of utilities that extend clib, powersets of integers and chars, long-period random numbers, and Wirth's P4 compiler. It also contains Tinker, a Tcl-like interpreter that is small, easy to embed into a program, but not particularly fast (two out of three ain't bad!) If you want an extension or scripting language for your program, and don't want the whole Tcl package, Tinker will be a welcome tool.

Ctypes: 'ctypes' is a ffi (Foreign Function Interface) package for Python. It lets you call functions from dlls/shared libraries and has facilities to create, access and manipulate simple and complicated C data types transparently from Python - in other words: wrap libraries in pure Python.

Cuetools: 'cuetools' is a set of utilities for working with cue files and TOC files. It includes programs for conversion between the formats (cueconvert), file renaming based on cue/TOC information (cuebreakpoints), and track breakpoint printing (cueprint).

Curl: cURL is a command line tool for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, Gopher, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMTP, SMTPS, Telnet and TFTP. curl supports SSL certificates, HTTP POST, HTTP PUT, FTP uploading, HTTP form based upload, proxies, cookies, file transfer resume, user+password authentication (Basic, Digest, NTLM, Negotiate, kerberos...), proxy tunneling, and so on.
llibcurl
The client-side URL transfer library that the cURL command line tool uses to transfer data. In some distributions, this library is packaged separately.

Cursynth: Cursynth is a polyphonic music synthesizer that runs graphically inside your terminal. You can play Cursynth as a standalone soft-synth with your computer keyboard or MIDI keyboard.

Cutmp3: 'cutmp3' is a small command line MP3 editor. It lets you select sections of an MP3 interactively or via a timetable and save them to separate files without quality loss. Silence and ID3 tag searching are also possible. For playback it uses mpg123. The program works with VBR files and files bigger than 2GB.

Cutter: 'Cutter' lets network administrators close TCP/IP connections running over an iptables firewall. It closes the connection in such a way as to lead both ends (client and server) to believe that it was aborted by the other.

Cvs

Version control system and important component of Source Configuration Management (SCM). Lets you record the history of source files and documents. It's similar to the free software RCS, PRCS, and Aegis programs, but has the following significant advantages over RCS:

runs user scripts to log operations or enforce site-specific policies
lets separatedevelopers operate as a team
vendor branches keep versions separate, but also merge them if needed
unreserved checkouts let developers work simultaneously on the same files
flexible modules database maps names to the components of a larger database
runs on most Unix variants; clients for Windows 95/NT, OS/2, and VMS available

Cvs-Brancher: 'Cvs-Brancher' establishes a tagged branch in a CVS module and schedules a merge and build to occur at a later date/time. It might be used to roll out Website changes at odd hours, such as posting a press release in time for the start of the business day on the east coast, or to roll out cfengine changes to a data center during the night, to minimize the impact of downtime.

Cvs2cl: cvs2cl produces a GNU-style ChangeLog for CVS-controlled sources, by running "cvs log" and parsing the output. Duplicate log messages get unified in the Right Way.

Cvs2html: Perl program to transform the 'cvs log' output to HTML. The HTML output shows the revision log history and differences between versions, and can be configured to show the amount of information the user like to see from the CVS repository. cvs2html can be used for any type of cvs archive. The program can be used on any type of cvs archive, but since it invokes cvs itself, it must be run onn a machine with a local checked out copy of the archive and access to the repsitory.

Cvsdelta: 'cvsdelta' works with a CVS project, producing a list of the local files that have been changed. It lists the number of lines of code that have been added, removed, and deleted. It can also execute the "add" and "remove" commands for the appropriate files. It detects files that have been added and removed, and of existing files it counts the number of lines that have been added, deleted, and changed. It filters project changes by using .cvsignore files, both system-wide and locally. Via the --execute option, cvsdelta can also perform the related operations with CVS, that is, it can add and remove the appropriate files. Again, .cvsignore files are honored. Thus, "cvsdelta --execute" will add all new files to the CVS project.

Cvsfs: cvsfs is an attempt to let a user mount a CVS project like any file system. It allows you to navigate and browse through a project tree. No preparations are required on the CVS server It allows to view the versioned files as like they were ordinary files on a disk. There is also a possibility to check in/out some files for editing

Cvsplot: Cvsplot is a Perl script which analyses the history of a CVS-managed project. The script executes on a set of files, analyses their history, and automatically generates graphs that plot lines of code and number of files against time. This project used to be known as cvsstat, but since an unrelated script with the same name already existed, the name was changed to cvsplot.

Cvsstat: 'cvsstat' transforms the 'cvs status' output to an ASCII table sorted after the status of files. It can be used for any type of CVS archive, local as well as remote. Note that the program requires fast access to the repository.

Cw: 'cw' is a non-intrusive real-time ANSI color wrapper for common commands. It simulates the environment of the commands being executed, so that if a person types 'du', 'df', 'ping', etc. in their shell, it will automatically color the output in real-time according to a definition file containing the color format desired. It supports wildcard match coloring, tokenized coloring, headers/footers, case scenario coloring, command-line- dependent definition coloring, and includes over 50 pre- made definition files.

Cwtext: 'cwtext' accept ASCII text as input and generates International Morse Code as output. The output formats can be: stdin to ASCII Morse code (dotscii- dots and dashes on the console), raw 8-bitPCM suitable for piping to /dev/audio, .wav files, or even mp3 or ogg. It also has tools for pulling info from the Internet and presenting it in Morse code.

Cxcl: 'cxcl' is an interpreter for the XCLE language. It is part of the XCL software suite, which aims to provide developers with tools for the programmatic handling of executable code, combining easy generation and manipulation with execution speed and memory efficiency at runtime.

Cxmon: 'cxmon' is an interactive command-driven file manipulation. It has commands and features similar to a machine code monitor/debugger, but cannot run or trace code. There are, however, built-in PowerPC, 680x0, 80x86, 6502 and Z80 disassemblers. 'cxmon' is primarily intended for emulation development but it can be used as a generic tool for manipulating and analyzing binary data and machine code, or just as a hex calculator.

Cxref: 'Cxref' produces documentation (in LaTeX, HTML, RTF or SGML) including cross-references from C program source code. It works for ANSI C, including most gcc extensions. The documentation for the program is produced from comments in the code that are appropriately formatted. The cross referencing comes from the code itself and requires no extra work. Documentation is produced for files, functions, variables, #include, #define, and type definitions. Cross referencing is performed for files, #include, variables, and functions.

CxxTest: CxxTest is a JUnit/CppUnit/xUnit-like framework for C++ that doesn't require RTTI, member template functions, exception handling, or any external libraries (including memory management, file/console I/O, or graphics libraries). It is distributed entirely as a set of header files which makes it extremely portable and usable.

Cyberradio1

Cython: The Cython compiler for writing C extensions for the Python language. The Cython language makes writing C extensions for the Python language as easy as Python itself. Cython is a source code translator based on the well-known Pyrex, but supports more cutting edge functionality and optimizations. The Cython language is very close to the Python language (and most Python code is also valid Cython code), but Cython additionally supports calling C functions and declaring C types on variables and class attributes. This allows the compiler to generate very efficient C code from Cython code.

Cz2cz: 'cz2cz' is a set of tools for converting texts between the various charset encodings that are used in the Czech language. The most important feature is autodetection of the most-used encodings (ISO-8859-2, Win-1250, cp850, and Kamenickych). It also lets you convert characters with diacritics to TeX (LaTeX) conventions. Additionally, you can use the interactive part of cz2cz tools for quick manual complementing of diacritics to texts.

DACT: DACT is a compression tool designed to compress a file dynamically, choosing the algorithm that works best per block of input data to produce an overall smaller output file.

DBG-Server: 'DBG' is a PHP debugger and profiler. It's can backtrace errors. It shows local and global variables as well as parameters which have been passed to all nested function calls at any point of execution. It also lets you execute scripts in a step-by-step manner, set breakpoints (including conditional ones), evaluate expressions, and watch variables. The profiler lets you find bottlenecks in PHP code at the functions level, the modules level, and even the source lines level.

DBI Frame: DBI::Frame is an extension of the standard DBI perl module, designed around MySQL, used to create and maintain frameworks for databases. It has query logging and a standardized interface for SQL statements like 'update' and 'insert' that doesn't require understanding SQL. Ideally, the user or developer shouldn't have to know SQL to be able to administer a database; this does require a special setup which isn't necessarily easy to create.

DBIx Simple: DBIx::Simple provides a simplified interface to DBI, Perl's powerful database module. It is aimed at rapid development and easy maintenance, but not at SQL abstraction

DHEX: 'dhex' is an ncurses-based hex-editor with a diff mode. It makes heavy use of colors, but is also themeable to work on monochrome monitors. It includes the Action Cartridge Search Algorithm to find specific changes.

DIAP: DIAP (Distributed Internet Archiving Protocol) is a set of Bash shell scripts to set up a system using three backup nodes either between sites (e.g. between offices and homes) or over WANs. The application provides a decentralized, self-contained and managed storage utility. The emergence of a DVTL (Distributed Virtual Tape Library) is the end result. Nodes can be dedicated to storage or used for existing services over unused bandwidth. The scripts are a toolkit to help users set up their own project, and to help the writer improve the system and work in user space over SSH.

DM Tools: DMTools is an ongoing project to develop a data mining toolbox written in Python. Two core features of the toolbox are caching of database queries and parallelism within a collection of independent queries. Our toolbox provides a number of routines for basic data mining tasks on top of which the user can add more functions - mainly domain and data collection dependent - for complex and time consuming data mining tasks.

DNSleak: DNSleak inspects DNS packets on the local network interface to detect leaks. Unlike web-based solutions, it works at the local computer level. No third party servers are used and DNS leak result is a true/false response.

DSPAM: DSPAM is a server-side anti-spam agent for UNIX email servers. It masquerades as the email server's local delivery agent and filters/learns SPAM using a Bayesian statistical approach which provides an administratively maintenance-free, self-learning anti-spam service. Each email is broken down into its most interesting tokens, each assigned a spam probability. All probabilities are then combined to produce a statistical probability of spam. This approach, applied to a mature corpus of email, has the potential to yield a 99.5% success rate with only 0.03% chance of false positives.

DULog: This is a candidate for deletion: broken links, can't find elsewhere, software not on archive.org, my email to author was returned to sender. Danm (talk) 13:26, 10 November 2017 (EST) DULog is a new log notifier and parser that periodically tails system logs, parses the output to present it in an easily readable format (parsing modules currently exist only for GNU/Linux), and mails a final report to the administrator. It can run daily or hourly. DULog is written specifically for large clusters where many systems (50+) log to a single loghost using syslog or syslog-ng. It can be used on standalone systems, but other packages (ie logwatch) are probably more suitable for such purposes. As of May 8, 2003, the DUlog project has been superseded by the 'epylog' project. While the information on this website remains current, the maintainers suggest you refer to epylog as it will be an ongoing project.

DUNE-Grid How To

DUNE, the Distributed and Unified Numerics Environment is a modular toolbox for solving partial differential equations (PDEs) with grid-based methods. It supports the easy implementation of methods like Finite Elements (FE), Finite Volumes (FV), and also Finite Differences (FD). DUNE is free software licensed under the GPL (version 2) with a so called "runtime exception" (see license). This licence is similar to the one under which the libstdc++ libraries are distributed. Thus it is possible to use DUNE even in proprietary software. The underlying idea of DUNE is to create slim interfaces allowing an efficient use of legacy and/or new libraries. Modern C++ programming techniques enable very different implementations of the same concept (i.e. grids, solvers, ...) using a common interface at a very low overhead. Thus DUNE ensures efficiency in scientific computations and supports high-performance computing applications. DUNE is based on the following main principles:

Separation of data structures and algorithms by abstract interfaces.- This provides more functionality with less code and also ensures maintainability and extendability of the framework.
Efficient implementation of these interfaces using generic programming techniques.
Static polymorphism allows the compiler to do more optimizations, in particular function inlining, which in turn allows the interface to have very small functions (implemented by one or few machine instructions) without a severe performance penalty. In essence the algorithms are parametrized with a particular data structure and the interface is removed at compile time. Thus the resulting code is as efficient as if it would have been written for the special case.
Reuse of existing finite element packages with a large body of functionality.- In particular the finite element codes UG, ALBERTA, and ALUGrid have been adapted to the DUNE framework. Thus, parallel and adaptive meshes with multiple element types and refinement rules are available. All these packages can be linked together in one executable.
The framework consists of a number of modules which are downloadable as separate packages. The current core modules are:
dune-common- contains the basic classes used by all DUNE-modules. It provides some infrastructural classes for debugging and exception handling as well as a library to handle dense matrices and vectors.
dune-grid- is the most mature module. It defines nonconforming, hierarchically nested, multi-element-type, parallel grids in arbitrary space dimensions. Graphical output with several packages is available, e.g. file output to IBM data explorer and VTK (parallel XML format for unstructured grids). The graphics package Grape has been integrated in interactive mode.
dune-istl (Iterative Solver Template Library)- provides generic sparse matrix/vector classes and a variety of solvers based on these classes. A special feature is the use of templates to exploit the recursive block structure of finite element matrices at compile time. Available solvers include Krylov methods, (block-) incomplete decompositions and aggregation-based algebraic multigrid.

DVC for Emacs: This is a candidate for deletion: Links broken. No links to page. No response to email to maintainer. Poppy-one (talk) 11:17, 31 July 2018 (EDT) DVC is a common Emacs front-end for a number of distributed version control systems. It currently supports GNU Arch, Bazaar, git, Mercurial, and Monotone. Support for Darcs is being worked on but still lacks some features.

Dabo: Dabo is a framework for developing enterprise-grade 3-tier database applications. It is database- agnostic, and currently supports MySQL, PostgreSQL, Firebird and SQLite as backends, with MS SQL support in development. It currently wraps wxPython for its UI layer, although other UI toolkits may be supported in the future. Dabo's ui module is an excellent replacement for raw wxPython. It wraps wxPython controls, and provides a much more Pythonic API to them. Many people who aren't connecting to databases are using dabo.ui to develop their apps, as they are much more productive than with raw wxPython.

Daemonize: daemonize runs a command as a Unix daemon.

Danectl: DNSSEC DANE implementation manager: Generates and manages TLSA records (with certbot). Implements TLSA 3 1 1 current + next workflow. Also generates SSHFP, OPENPGPKEY, and SMIMEA records.

DansTuner

'DansTuner' tells you if you are playing a pitch in tune. Its features include:

automatic discovery of which note you are trying to play (good for trumpet, singer, etc.)
ability to play a guide tone for you at a configurable volume
a graphical moving "needle", a red/green display, and details about how flat or sharp you are
an easily configurable background noise threshold

This package was written by a trumpet player, who needed to tune lots of different notes on the fly. Many of the free packages out there are "guitar" tuners that must first be told which few notes you are trying to tune.

Dap: Dap is a small statistics and graphics package, based on C, that provides core methods of data management, analysis, and graphics commonly used in statistical consulting practice. Anyone familiar with basic C syntax can learn Dap quickly and easily from the manual and the examples in it. Advanced features of C are not necessary, although they are available. As of Version 3.0, Dap can read SBS programs, thereby freeing the user from having to learn any C at all to run straightforward analyses. The manual contains a brief introduction to the C syntax needed for C-style programming for Dap. Because Dap processes files one line at a time, rather than reading entire files into memory, it can be, and has been, used on data sets that have very many lines and/or very many variables.

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