Uninstall Java Command Line Linux

javac HelloWorld. By default, it does not remove directories. To uninstall software from a computer running Ubuntu Linux, start by opening Ubuntu Software by clicking the icon that looks like an orange suitcase with a white "A" on it. If you continue to use this site, you agree to the use of cookies. This command will completely remove Opera configurations from my system. I'm Scott Simpson, and in this course, I'll introduce you to the basics of working with a Linux command line using the very common shell called Bash. Once you become familiar with the steps, it will be much faster than having to access the Add/Remove Programs applet in the Control Panel. I’d like to save some disk space so I’d like to remove unwanted software from my HP laptop. Sed Command to Delete Lines: Sed command can be used to delete or remove specific lines which matches a given pattern or in a particular position in a file. Ant is an. The following pop up message is displayed randomly on a Macbook Pro: "To use the java command line tool you need to install a JDK. Most of us believe that it is difficult to remove/uninstall (Oracle Java & openJDK) from Linux box. rm -r mydir In the example. There are many people who would like to use Linux instead of Windows but are deterred because they believe in Linux myths such as it is difficult to use. The CLI is designed to make scripting easy, query data, support long-running operations, and more. When asked if you want to continue, type a “y” and press “Enter”. Click on the latest Java version listed there and click on Uninstall. It allows users and system administrator to easily install, update, remove or search software packages on a systems. I’ll show you how it works! To encode text to base64, use the following syntax: To decode, use base64 -d. Comment and share: How to run VirtualBox virtual machines from the command line By Jack Wallen Jack Wallen is an award-winning writer for TechRepublic and Linux. You must run the imcl commands from the tools directory. Re: Java command Line - Remove out of Date JRE's [email protected] Where do I find the JDK install to uninstall? @terdon had explained using an rpm type download so it would be easier to uninstall, but I cannot find it. The Windows operating system doesn't even have a proper command line built in — to execute these commands, you will have to install one. JS using Linux command line? - Wikitechy. With just one tool to download and configure, you can control multiple AWS services from the command line and automate them through scripts. grep "\S" file. javac HelloWorld. This post shows how to install Sun's java implementation alongside the Linux default GNU java. Replace filename with the file or files for which you want information. exe icon to cause the command-line shell to pop-up a terminal window running SQLite. I am an admin and have to do this over 400 times, and I can't do this by hand. To download this legacy version of Java, to fix the "To use the java command-line tool you need to install a JDK" error, go here: Fix the "To use the java command-line tool you need to install a JDK" error" now! At the top of the page at that link, you will see this: Just click on 'Download', and you will have quickly fixed the issue. But that will remove the and \r whcih are found in the end of each line and I do not want to do that Following is the example: 1abcdef E 1ghijk E 1kmijol E 1kfcldsa cdsc;mE 1kcdmlms E Here want to remove the carrriage return from the last but one line, since we need 1 as the first char and E as the last char. By using a combination of expressions and boolean logic, the find command can help us locate files and directories efficiently. This prefix can be removed as long as the share, bin, man and doc directories are moved relative to each other. The JDK is usually only needed if you are going to compile Java programs or if the software that will use Java specifically requires it. Command line extension management. It can be used on Windows, Linux, Mac OS X, Solaris and some other operating. If Java is not installed on your system, or the version of Java is earlier than 1. When it opens, run the command below. Normally, the javac command compiles only the file that you specify on the command line, but you can coax javac into compiling more than one file at a time by using any of the following techniques:. As with other Linux distros, you can now download Debian GNU/Linux from the Windows Store. \Uninstall. The entry point for the OpenSSL library is the openssl binary, usually /usr/bin/openssl on Linux. I'm Scott Simpson, and in this course, I'll introduce you to the basics of working with a Linux command line using the very common shell called Bash. Remove the "Java" folder; Empty the Trash on the Mac as usual; Java will be removed completely this way. But for many use cases, the command line is still absolutely. It was installed using (webupd8) repository. Download EMCLI; Linux Installation; Windows Installation; Starting EMCLI; Verb Reference. Simply put, Maven is a command-line tool for building Java applications. gz and jre-8u112-linux-x64. The guide that I follow for remove it is that answer, this and this. Oracle WebLogic Server (WLS) 11gR1 (10. Command-line tool. I am an admin and have to do this over 400 times, and I can't do this by hand. (if you have Linux x64, download the x64 bit package, do not download the RPM!!) 1. Most people don't use the command line on a regular basis, so it can be a bit difficult to find the first time. Once it opens, click the "Installed" tab and scroll through the list to find the software you want to uninstall. Operating system: Windows 7 or newer, 64-bit macOS 10. The real purpose of this article is to help Linux newbies get comfortable and confident with the Linux command-line. Open a command line window and navigate to your Ruby scripts directory using the cd command. exe -q During a silent uninstall via command line, the configuration files are kept so that if you re-install in future, the installer repairs or upgrades using existing settings, without asking you to input them again. Most of the users tend to find the windows version by right clicking Computer and checking the Properties which shows the Windows operating system name, windows edition and other details. Applications developed in Java are scalable, flexible and maintainable. suf instead of. This guide will be more useful for them to set up a development environment when they especially use RHEL 7 or CentOS 7. Today Powershell is doing a lot of changes to the windows environment that includes both the Server platform and the desktop platform. which command only searches for executable files in directories that are listed in a special variable called the PATH variable in the current BASH shell. The find command is an essential one to learn, if you want to get super productive with the command line on linux. The syntax is relatively simple:. In the previous examples provided here and here, we saw how to generate XML Schema from Java classes using ‘schemagen’ command line tool and in Eclipse IDE. exe or command. ***** Java uninstall script started at 12/06/2013 08:02:10-----Script parameters: Specified Java versions found will be kept. No x86 Java versions for x64 systems specified on the command line. In Linux and Unix when you want to stop a running process you can use the kill command via the command line interface. By using the Windows Instrumentation command-line interface (WMIC), you can easily uninstall an application without having to use the GUI. Linux distributions can leverage an extensive range of commands to accomplish various tasks. Note: If you are installing this on Ubuntu or debathena, please view [these instructions]. The command line can be a scary place when you first encounter it. Download the tar. The following preinstallation steps are recommended for Linux distributions. Create MySQL Database, Table & User From Command Line Guide This article describes how to do common MySQL database administration tasks from the command line using the mysql program. There are two basic commands that you can use in order to accomplish this task: chmod and chown. Now that Java JDK 8 is installed, got and download Eclipse Oxygen IDE package for your systems. MATLAB uses the Java ® Virtual Machine (JVM™) software to run the desktop and to display graphics. For more information about all available command options type man rpm in your terminal or visit the RPM. Simply open the command line by typing the word “run” into your Windows Start Menu, or execute the cmd. If you are using the command line to kill a process, you can use the command line to find the process info also. There is no installer. If the Firefox is not installed yet it will be installed: $ sudo apt install firefox Uninstall Firefox To uninstall Firefox execute the following linux command: $ sudo apt remove firefox. Kali Linux is a Debian-derived Linux distribution designed for digital forensics and penetration testing. Configure and install using command-line parameters Deploy using System Center Configuration Manager 2012 R2. I'm new to Linux, and I got a little problem. This post explains how to use 'del' command from CMD for different use cases like deleting a single file, deleting files in bulk using wild cards etc. It supports interactive and non-interactive use. hi i have to write a command line to uninstall java where it get current version already installed in system ?(suppose one system having jre-6u29 where other having jre-7). dll) which acts as a Linux API layer providing substantial Linux API functionality. If any of the file names specified on the command line are directories, gzip will descend into the directory and compress all the files it finds there (or decompress them in the case of gunzip). Step 1: Install Java (JRE/JDK) on Ubuntu. Operating System: - Ubuntu 18. 32 Bit version:. rpm file, which is under “Linux x64” for 32-bit linux, download the jdk-8u131-linux-i586. If you are running the installer in a headless Linux installation or through an SSH shell, the text installer opens automatically. In this tutorial we can check how to safely delete files and directories using Linux Command line. For more information about all available command options type man rpm in your terminal or visit the RPM. Webupd8 Team is maintaining a PPA repository with installer scripts for the latest Java 8 and 9, that automatically downloads the Java archive from Oracle website and sets up everything for you. FIX: To use the java command-line tool you need to install a JDK (MAC OS X) Last updated on February 17th, 2018. proxyPort=8000. Due to Oracle (Sun) licensing policies, Java JRE cannot be included in the repositories of openSUSE anymore. The locations at the command prompt of the arguments as well as the location of the command, or the script itself, are stored in corresponding variables. Now that there are suitable candidates to change to, you can switch the default Java version among available Java JREs by running the following command:. For 64-bit linux, download the jdk-8u131-linux-x64. 7 and Java 1. This story, "Manipulating JARs, WARs, and EARs on the command line" was originally published by marxsoftware. This command will install the Java Runtime Environment (JRE) and should be enough for most users. Consider the following subsection of a Unix filesystem, which shows a user's home directory (represented as ~ ) with a file, text. However, there. it's an ugly process so far to get an install of a different version of mysql. please help me. List of Chromium Command Line Switches. To install pip on Ubuntu, Debian or Linux Mint:. Our mission is to put the power of computing and digital making into the hands of people all over the world. ini configuration file. exe, where rar. Dealing With Spaces in File Names in Command-line (GNU/Linux) January 26, 2017 February 4, 2014 by Gayan Most people that use the GNU/Linux operating system do not like to deal with the command-line at all, though having a basic understanding of it (such as memorizing commands for mounting devices and copying files for instance) can come in. As its man page suggests, it's a minimalistic emulator of sendmail. In this article we are going to see how to update java version from 1. Most commonly used shell is bash • The kernel sits on top of the hardware and is the core of the OS; it receives. Are you Curious about Linux, but not sure where to start ? Start here: "Linux Command Line Tutorial For Beginners" will teach you everything. It is recommended that you use the -cp (or -classpath) command-line option (customized for each of your applications), instead of setting a permanent CLASSPATH environment. Download the tar. This page explains how to use the bq command-line tool to run queries, load data, and export data. Use the convert program to convert between image formats as well as resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. sudo umount /dev/sdc1 Now, Use one of the following commands as per the file system you want. 145 comments on " Install Sun/Oracle Java JDK/JRE 6u45 on Fedora 19/18, CentOS/RHEL 6. This wikiHow teaches you how to install the latest version of the Java Runtime Environment (JRE) on a computer running Linux. Eclipse now will launch without additional arguments in the command-line, with the JVM specified in the eclipse. Download it for free. Get the line, word, or character count of a document in Unix. In this tutorial we can check how to safely delete files and directories using Linux Command line. Check the Java version on the server, then make sure the command line switches are still valid. Ensure that the following dependencies are installed: bash, curl, rlwrap, and Java. RPM Uninstall; Self extracting Uninstall; Java Plug-in Uninstall: Mozilla browser If you are going to reinstall Java, you don't need to uninstall Java Plug-in. Apache apt-get awk Bash CentOS command curl Debian diff dns Fedora filesystem find git grep ImageMagick java linux mac mac terminal memory usage Mercurial MongoDB MySQL network networking Nginx performance Perl PHP Python redhat rpm Ruby security sed shell smtp ssh svn Ubuntu vi vim wget xargs. This command serves as the basis for any other command-line tasks you perform. The script should ask you for your. If the jre folder (the Java runtime) is missing, ImageJ. Last Upated: Sat Oct 26, 2019. The Linux rm command is used to remove files and directories. javac filename [options]. clamscan(1) - Linux man page Name. exe file at C:\Windows\System32\cmd. This wikiHow teaches you how to install the latest version of the Java Runtime Environment (JRE) on a computer running Linux. I have been a Linux user for roughly 25 years, and time and time again I find myself going back to the command line to install my apps. Click the Remove button on this dialog and then provide authentication details. That way we will be able to remove the hardcoded launcher options and allow modules to provide own extensions. I am using linux ubuntu 16. To change the default Java version, just enter the number when prompted and hit Enter. How do I uninstall software under Ubuntu / Debian Linux? synaptic is graphical management tool of software packages. [email protected]:~$ java -version bash: /usr/bin/java: No such file or directory So the above suggests that there is no java found of any version. The syntax is relatively simple:. We can also use powershell script to uninstall software. 8 or the aws-apitools will also be removed as they depend on Java on being installed. How does the Linux OS work? Hardware Kernel Shell, editors, etc. rb file extension. This option is disabled by default. The Windows operating system doesn't even have a proper command line built in — to execute these commands, you will have to install one. Encode or Decode base64 from the Command Line. The below given guide works on all version of Ubuntu 14. Command-line arguments are given after the name of a program in command-line operating systems like DOS or Linux, and are passed in to the program from the operating system. How to Uninstall Java via Command Line? 3068937 Nov 10, 2015 3:27 PM I don't know if I'm in the right place because navigating the Oracle/Java websites is a rat's maze. ” This way of installation will not configure a default Java command for you — you must do this manually or always include the full path in your startup script. So I hope you can help me with this. The Add/Remove control panel displays a list of software on your system, including any Java software products that are on your computer. If the command line is prefixed with ++ then it's value will be appended to the existing option. Mostly they suggested using the terminal is the best way to uninstall a software in Linux. InstallAnywhere installers and uninstallers can be run using the following command-line arguments. Linux, Solaris, or IBM AIX. EMCLI : Installing Enteprise Manager Command Line Interface for Cloud Control 12c and 13c. Installing Sun Java alongside the default GNU java Sun's java isn't installed by default on RedHat systems. -openjdk-devel package. Command-Line Options. This page shows how to delete and remove files. By default, history command stores last one thousand commands in their output. Specifying command line options is useful when you are testing Logstash. tar is the name of the tar file). Wireshark - The network protocol analyzer that we all know and mostly love. The Apex Data Loader provides a handy GUI for accomplishing these tasks, but using the GUI requires some human interaction. Fortunately the Linux command line has all the tools we need to quickly and easily generate any kind of data file that we require (I am of course assuming that as a self-respecting developer you’re using or at least have access to a Linux system :)). Tutorial about How to install JRE for Linux Mint is almost identical for JDK. Installing Sun Java alongside the default GNU java Sun's java isn't installed by default on RedHat systems. Sometimes initializing the. The command line is a text interface for your computer. To uninstall the IDE: Shut down the IDE. Get the line, word, or character count of a document in Unix. tar is the name of the tar file). Java and the Linux Command Line This document instructs you on how to use the Linux shell with Java. 145 comments on " Install Sun/Oracle Java JDK/JRE 6u45 on Fedora 19/18, CentOS/RHEL 6. If you want to remove all Java-related software use the following line: wmic product where "name like 'Java%%'" call uninstall. So I hope you can help me with this. Before You Begin. In this example, the for loop leads to an assessment for each line, rather than as assessment of every word in the file. bat) and a shell script for Linux and Mac (gradlew. Steps to Download and Install Eclipse Linux version on Ubuntu via command line. How to delete a specific line from a text file in command line on Linux? tagged Bash, Command, Command line, Howto, Linux, Programming, text, Tutorial. How to remove files which contain the name "java". Remove the "Java" folder; Empty the Trash on the Mac as usual; Java will be removed completely this way. Finding the Command Line. Of course you can just use the arrow up to get back to the previous line, press CTRL-A to get to the beginning of the line, delete three characters and right vi instead of cat. Command Line Tips. exe (a = alone) is a standalone version of 7-Zip. Provides the command line interface for running program that can install an Android app or test package, run it, send keystrokes to it, takes screenshots, and more. To change the default Java version, just enter the number when prompted and hit Enter. Note: If you are installing this on Ubuntu or debathena, please view [these instructions]. clustering describes clustering, cloud, and dynamic servers. First download jdk-8u112-linux-x64. While knowledge and comfort of the Linux GUI allow great power, it is the mastery of the command line, or CLI, affords the Linux user unlimited power and certifies them as a Linux power user well on their way to becoming an expert. Command line parameters: Each command parameter is prefixed with --. The main known usage of Ant is the build of Java applications. i lost my teacup icon in control panel, Java Control Panel, i have tried to reinstall but all i get is a prompt i had a successful install but java cannot be detected anywhere but in programs as update. It tries to remove the files specified on the command line. DO java -version to get yours. Be sure to accept the Oracle license! Step #3: Verify Installation. You can access your Android device via the adb command on the command line. For example, go run hello. When we shipped WSL in Windows 10 AU, we brought Linux and Windows alongside one another, but there was still a large “gap” – while both systems could share some of the same files, each. The trash-cli application provides a command line trash can. Learn the Linux command line. How to Delete a Local User Using Command Line on Mac OS X November 7, 2013 amida168 Mac OS 0 One user reported that she could not log on using her regular network account on a particular Mac computer. This Page Contains information about How To Count The Number Of Lines In A File In Linux Shell Command By tomas in category Linux Systems with 52 Replies. Go to the following link and download jdk7. (up one level) \ (use as last char in line to continue typing command on next line) exit pwd - print working directory Ctrl+A, Ctrl+E - move cursor to beginning/end of line Ctrl+C - kills the current program/command Ctrl+D - indicate EOF on keyboard Ctrl+P, Ctrl+N - select previous/next command in history Ctrl+Q - contiues output on the screen. cat /etc/hosts vi /etc/hosts. Install and uninstall Citrix Receiver for Windows manually. Fortunately, Sun provides a command that allows you to clear the Java Web Start Cache. This command will install the Java Runtime Environment (JRE) and should be enough for most users. Here's how it's executed: Hold down the Windows key and press "R" to bring up the Windows Run dialog. Also, remember to keep each word or flag within the command line options in its own element (e. Working in Linux requires some prior knowledge as the commands have to be given through command line text. The machines will then be re-frozen by DeepFreeze. Conquering the Command Line Unix and Linux Commands for Developers Mark Bates Learn to master and conquer the most valuable and useful command line tools for Unix and Linux based systems. Kali Linux is a Debian-derived Linux distribution designed for digital forensics and penetration testing. Go by Example: Command-Line Arguments Command-line arguments are a common way to parameterize execution of programs. It is similar to the DOS command prompt available with Windows. Welcome to the HP Developers Portal , home of HP's Linux Imaging and Printing software (HPLIP). So I hope you can help me with this. By default when you compress a file or folder using the gzip command it will have the same file name as it did before but with the extension. The guide that I follow for remove it is that answer, this and this. sudo mkdir -p /usr/local/java. Once you have Debian GNU/Linux installed, go ahead and launch the application. How to Remove/Uninstall (Oracle Java & openJDK) on Linux. If you haven’t tried it you should. Yesterday I installed a webmin rpm package by running rpm -ivh webmin. In this tutorial we define the different ways to run an executable jar through the windows command line. To download this legacy version of Java, to fix the “To use the java command-line tool you need to install a JDK” error, go here: Fix the “To use the java command-line tool you need to install a JDK” error” now! At the top of the page at that link, you will see this: Just click on ‘Download’, and you will have quickly fixed the issue. Fortunately the Linux command line has all the tools we need to quickly and easily generate any kind of data file that we require (I am of course assuming that as a self-respecting developer you’re using or at least have access to a Linux system :)). To make it easier to automate and configure VS Code, it is possible to list, install, and uninstall extensions from the command line. Our mission is to put the power of computing and digital making into the hands of people all over the world. A simple windows command line tool (no. By default, it does not remove directories. In the previous examples provided here and here, we saw how to generate XML Schema from Java classes using ‘schemagen’ command line tool and in Eclipse IDE. To download this legacy version of Java, to fix the "To use the java command-line tool you need to install a JDK" error, go here: Fix the "To use the java command-line tool you need to install a JDK" error" now! At the top of the page at that link, you will see this: Just click on 'Download', and you will have quickly fixed the issue. rm file — remove file. and a repeat change `. How to Use Android ADB Command Line Tool. It's up to you to set up your prerequisites. net application can be run as a standalone executible. Kali Linux is a Debian-derived Linux distribution designed for digital forensics and penetration testing. Any flags that you set at the command line override the corresponding settings in logstash. Where do I find the JDK install to uninstall? @terdon had explained using an rpm type download so it would be easier to uninstall, but I cannot find it. Last automated update occurred on 2019-08-12. sh and go the following message #. Technically, this is all you should have to do, but if you really want to get rid of every trace of Java, I recommend using a freeware app called JavaRa. The system prompts with a Y/n option for removing or purging a software; always enter Y to proceed with software removal. 6, use the Linux Yellowdog Update, Modified (yum) utility to install a compatible version. So here's 25 basic linux commands for absolute beginners. At the bottom of the window is a version string line that contains either "Linux i686" (32-bit) or "Linux x86_64" (64-bit). This is because Sun hasn't licensed it for RedHat's. The AWS CLI introduces a new set of simple file commands for efficient file transfers to and from Amazon S3. Kick off the installer to completely install Java from the PPA. 0, version 11. which command only searches for executable files in directories that are listed in a special variable called the PATH variable in the current BASH shell. In this Unix command tutorial, we will see how to find the IP address of any host in a UNIX based system, e. I need to do a command line uninstall, and I can't figure out or find relevant the options for 1. In case in the future, you switch to another Linux distros the process of installing software using the command line will always remain the same unlike the GUI. It allows users and system administrator to easily install, update, remove or search software packages on a systems. Command-line parameters are passed to a program at runt-time by the operating system when the program is requested by another program, such as a command interpreter ("shell") like cmd. To Install in Command-Line Mode on UNIX and Linux. In case somebody finds this thread because they are uninstalling Java so that they can install an Old Version, I have included a walk-through I found. Remove your files wisely! It's not like putting something in the Windows Recycle Bin; once you rm a file or. We are all familiar with the FTP protocol and if you are reading this article you’ve probably used it for transferring files to your virtual server and your local computer. Mac OSX: Open the Applications folder and then the Cisco folder. Most commonly used shell is bash • The kernel sits on top of the hardware and is the core of the OS; it receives. Tags: no_op, deprecated--[no]experimental_oom_more_eagerly default: "false" If set, attempt to detect Java heap OOM conditions and exit before thrashing. clamscan(1) - Linux man page Name. IDEs and tools (especially build tools) can help a lot with Java archive file manipulation, but sometimes the "overhead" of these is much greater than what is required when using jar from the command line. The general syntax for calling openssl is as follows: $ openssl command [ command_options ] [ command_arguments ] Alternatively, you can call openssl without arguments to enter the interactive mode prompt. Java JDK is the most important base for the developers. Here's how it's executed: Hold down the Windows key and press "R" to bring up the Windows Run dialog. But once you start to understand how the command line environment works, you'll see how powerful and efficient it can be. command line file encryption. This ensures that applets will run on the latest and most secure version of the JRE software. 0-openjdk" The java-1. (As its name implies, this is a dangerous command, so be careful. Select the program to uninstall, and then right-click and select Uninstall or you can click the Uninstall option located at the top of the programs list. If you are running the installer in a shell in a graphical environment, the graphical installer opens automatically. com and store the file in the folder Downloads. using vm linux. Otherwise, if a file is unwritable, standard input is a terminal, and the -f or --force option is not given, or the -i or --interactive=always option is given, rm prompts the user for whether to remove the file. The guide that I follow for remove it is that answer, this and this. com, question and answer web site) List of DOS commands (Wikipedia). Many of these options are important for performance tuning and diagnostic purposes, and are. Choose properties. This article talks about using command line commands to remove files under Mac OS X, Unix, and Windows. Access Client Solutions can be started with executable launchers or by calling Java™ directly. How to remove files which contain the name "java". Operating system: Windows 7 or newer, 64-bit macOS 10. similar steps can be follow for Amazon Linux. Powershell script to install software is so simple then doing it in the GUI. It creates a runtime environment, loads the specified class, and then invokes that class's main() method. This command serves as the basis for any other command-line tasks you perform. 04 Bionic Beaver Operating System and Software Versions. This results in a tar file called filename. jq is like sed for JSON data - you can use it to slice and filter and map and transform structured data with the same ease that sed, awk, grep and friends let you play with text. First, we will see how to find and remove unused packages in Ubuntu and its derivatives such as Linux Mint, elementary OS. Now I need to update my DELL M610 servers to latest versions (iDRAC, LifceCycle, Bios) via command line. Finding the PID of a running process. ) generate Java classes from XML Schema. Basic of Software’s in Linux Software in Linux is different than the usual software you find in windows like. The data itself is not destroyed, but after being unlinked with rm, it becomes inaccessible. But surprisingly, renaming a files in Ubuntu Linux, via command line is quite easy. The most common method of installing apps from the command line is through software repositories (a place where software is stored) using what's called a package manager. At the bottom of the window is a version string line that contains either "Linux i686" (32-bit) or "Linux x86_64" (64-bit). The command prompt should look something like: C:\> This is where you type commands. TSM 6 for Linux - Install, Configure, Set Up, and Confirm the Scheduler. This post shows how to install Sun's java implementation alongside the Linux default GNU java. Here you will learn the Linux command line (Bash) with our 13 part beginners tutorial. Apache apt-get awk Bash CentOS command curl Debian diff dns Fedora filesystem find git grep ImageMagick java linux mac mac terminal memory usage Mercurial MongoDB MySQL network networking Nginx performance Perl PHP Python redhat rpm Ruby security sed shell smtp ssh svn Ubuntu vi vim wget xargs.