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Bash
[2626 users on Ohloh]
Tags: gnu unix system shell sysadmin console posix
Bash is an sh-compatible command language interpreter that executes commands read from the standard input or from a file. Bash also incorporates useful features from the Korn and C shells (ksh and csh).

Bash is ultimately intended to be a conformant implementation of the IEEE POSIX Shell and Tools specification (IEEE Working Group 1003.2).

sudo
[1475 users on Ohloh]
Tags: sysadmin admin administration root
Sudo (su "do") allows a system administrator to give certain users (or groups of users) the ability to run some (or all) commands as root or another user while logging the commands and arguments.
GNU Make
[1336 users on Ohloh]
Make is a tool which controls the generation of executables and other non-source files of a program from the program's source files.
rsync
[991 users on Ohloh]
rsync is an open source utility that provides fast incremental file transfer.
GNU findutils
[852 users on Ohloh]
GNU findutils includes find, xargs, locate and updatedb. These tools proivide ways to search for files on your system by specifying what kind of file you're looking for.
GnuPG
[785 users on Ohloh]
GnuPG is the GNU project's complete and free implementation of the OpenPGP standard as defined by RFC2440 . GnuPG allows to encrypt and sign your data and communication, features a versatile key managment system as well as access modules for all kind of public key directories.
Common Unix Printing System (CUPS)
[634 users on Ohloh]
CUPS provides a portable printing layer for Unix(r)-based operating systems. It has been developed to promote a standard printing solution for all Unix vendors and users. CUPS provides the System V and Berkeley command line interfaces, and uses the Internet Printing Protocol ("IPP") as the basis for managing print jobs and queues. The Line Printer Daemon (LPD) Server Message Block (SMB), and AppSocket (a.k.a. JetDirect) protocols are also supported with reduced functionality. CUPS adds network p...
Wireshark
[587 users on Ohloh]
Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure) standard across many industries and educational institutions.

(Wireshark was known as Ethereal until June 09, 2006)

Nmap Security Scanner
[513 users on Ohloh]
Nmap ("Network Mapper") is a free open source utility for network exploration or security auditing. It was designed to rapidly scan large networks, although it works fine against single hosts. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristic...
Cygwin
[351 users on Ohloh]
Cygwin is a Linux-like environment for Windows.
It consists of an emulation DLL providing Linux API functionality, and ports of thousands of Linux tools to Windows.
Clam AntiVirus
[286 users on Ohloh]
Clam AntiVirus (ClamAV) is an anti-virus toolkit for Unix. The main purpose of this software is the integration with mail servers (attachment scanning). The package provides a flexible and scalable multi-threaded daemon, a commandline scanner, and a tool for automatic updating via Internet. The programs are based on a shared library distributed with the Clam AntiVirus package, which you can use in your own software.
OpenVPN
[259 users on Ohloh]
OpenVPN is a robust and highly configurable VPN (Virtual Private Network) daemon which can be used to securely link two or more private networks using an encrypted tunnel over the Internet. OpenVPN's principal strengths include wide cross-platform portability, excellent stability, support for dynamic IP addresses and NAT, adaptive link compression, single TCP/UDP port usage, a modular design that offloads most crypto tasks to the OpenSSL library, and relatively easy installation that in most cas...
zsh
[249 users on Ohloh]
Tags: shell unix sysadmin system console
Zsh is a UNIX command interpreter (shell) which of the standard shells most resembles the Korn shell (ksh). It includes enhancements of many types, notably in the command-line editor, options for customising its behaviour, filename globbing, features to make C-shell (csh) users feel more at home and extra features drawn from tcsh.
AWStats
[205 users on Ohloh]
Advanced Web Statistics (AWStats) is a free powerful Web server logfile analyzer (Perl script) that shows you all your Web statistics including visits, unique visitors, pages, hits, rush hours, search engines, keywords used to find your site, robots, broken links, and more. It works with both IIS 5.0+ and Apache Web server log files as a CGI and/or from the command line. It also supports multiple languages including English, French, Dutch, Spanish, Italian, German, Polish, and Greek.
S.M.A.R.T. Monitoring Tools
[200 users on Ohloh]
smartmontools contains utilities that control and monitor storage devices using the Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.) system built into ATA and SCSI hard drives. This is used to check the reliability of the hard drive and to predict drive failures. It is meant to be an up-to-date replacement for the ucsc-smartsuite and smartsuite packages, and is derived from that code.
CPAN
[167 users on Ohloh]
The CPAN module automates or at least simplifies the make and install of perl modules and extensions. It includes some primitive searching capabilities and knows how to use Net::FTP or LWP or some external download clients to fetch the distributions from the net.

These are fetched from one or more of the mirrored CPAN (Comprehensive Perl Archive Network) sites and unpacked in a dedicated directory.

The CPAN module also supports the concept of named and versioned bundles of modules. B...

Mailman
[151 users on Ohloh]
GNU Mailman is software to help manage email discussion lists and e-newsletters. Its integrated Web interface provides easy-to-use access for list members and list administrators. Mailman supports built-in archiving, automatic bounce processing, content filtering, digest delivery, spam filters, topics, Usenet gateways, and more. It is fully internationalized, and supports digests and email commands. It runs on any Linux or Unix-like operating system and is compatible with most email and Web serv...
Hudson
[145 users on Ohloh]
Hudson is an automated build system for a team as well as a system that monitors automated jobs (such as cron jobs)
Nagios
[130 users on Ohloh]
Nagios (formerly Netsaint) is a daemon written in C that is designed to monitor networked hosts and services. It has the ability to notify contacts (via email, pager or other methods) when problems arise and are resolved. Host and service checks are performed by external "plugins", making it easy to write custom checks in your language of choice. Several CGIs are included in order to allow you to view the current and historical status via a Web browser, and a WAP interface is also provided to al...
iptables
[89 users on Ohloh]
iptables is the userspace command line program used to configure the Linux 2.4.x and 2.6.x IPv4 packet filtering ruleset. It is targeted towards system administrators.