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The update-alternative in Ubuntu/debian is used to manage different versions of the same software in a system.For example, the system may contain the GNU Java compiler, and the Sun's Java compiler. You can use Update-alternatives to set which of these are currently used.Its principle is to create a link in the/usr/bin, point to a file in the/etc/alternatives, and some file is a link, pointing to the current
settings can be. Ls-l--full-time/usr/java/jdk1.7.0_71 can see that the full installation time, the indication is really just installed. [Root@localhost sss]#/usr/java/jdk1.7.0_71/bin/java-version Java Version "1.7.0_71" Java (TM) SE Runtime Environment (build 1.7.0_71-b14) Java HotSpot (TM) 64-bit Server VM (build 24.71-b01, Mixedmode) As you can see, this Java is no longer an open JDK. Ok. Vi/etc/profile Add at the end of the file Export java_home=/usr/java/jdk1.7.0_71 Exportclasspath=.: $JA
The process of compiling Android source code refer to the Android website:1, download the Android source code step: https://source.android.com/source/downloading.html2, compile the Android source code step: https://source.android.com/source/building-running.htmlHere are some of the problems I have encountered:1. JDK-related error when Compile Android Source:Error 1:target release 1.5 conflicts with default source release 1.7 Workaround: Best use JDK for 1.6.0.45 version error 2:[ Out/target/com
environment variables, not to list them one by one)Ubuntu may have a default JDK, such as openjdk. If openjdk is available, we need to perform the following work to make JDK installed by default. 3. Configure JDK software: Code:Sudo Update-alternatives -- install/usr/bin/javac/usr/local/jdk1.6.0 _ 31/bin/javac 1071Sudo Update-alternatives -- install/usr/bin/Java/usr/local/jdk1.6.0 _ 31/bin/Java 1071Update-
of sun? Google found that the original RedHat is far less troublesome than the win system. There is an alternative system (Alternatives System) mechanism in RedHat to abstract the locations and trademarks of different software or different versions of the same software, so as to eliminate the need to replace the environment. Update-alternatives is the implementation of this mechanism. Therefore, you can us
Finally, the complete implementation of C ++ 11 GCC 4.8.1. Upgrade your system. The following steps install gcc4.8.1 with content from: http://askubuntu.com/questions/312620/how-do-i-install-gcc-4-8-1-on-ubuntu-13-04 First install a software apt-get install python-software-properties Then sudo add-apt-repository ppa:ubuntu-toolchain-r/testsudo apt-get updatesudo update-alternatives --remove-all gcc sudo update-al
the operation. Then download the tar.gz package for the corresponding JDK, and put it in:/var/cache/oracle-jdk7-installer (JDK7)/var/cache/oracle-jdk8-installer (JDK8)Below, and then install the installer once. Installer will use the TAR.GZ package you downloaded by default3. Set the system default JDKJDk7sudo update-java-alternatives-s java-7-oracleJDK8sudo update-java-alternatives-s java-8-oracleIf the J
corresponding JDK, and put it in:/var/cache/oracle-jdk7-installer (JDK7)/var/cache/oracle-jdk8-installer (JDK8)Below, and then install the installer once. Installer will use the TAR.GZ package you downloaded by default3. Set the system default JDKJDk7sudo update-java-alternatives-s java-7-oracleJDK8sudo update-java-alternatives-s java-8-oracleIf the JDK7 is installed and the JDK8 is installed, to switch be
installer because of a firewall or some other reason, you can interrupt the operation. then download the corresponding JDK tar.gz package, put in: /var/cache/oracle-jdk7-installer (JDK7) /var/cache/oracle-jdk8-installer (JDK8) Below, and then install the installer once. Installer will default to use the tar.gz package you downloaded 3. Set system default JDK JDk7 sudo update-java-alternatives-s java-7-oracle JDK8 sudo update-java-
1: Installed through the PPA (source) mode. 2: Download the installation package through the official website. 1th is recommended here because the JDK upgrade can be easily obtained by Apt-get upgrade method. install using the ppa/source method Add PPA sudo add-apt-repository ppa:webupd8team/java sudo apt-get update Install Oracle-java-installer Jdk7: sudo apt-get install oracle-java7-installer jdk8: sudo apt-get install Oracle-java8-installer The installer will prompt you to agree to Oracle
individual)If you cause installer to download slowly due to firewalls or other reasons, you can interrupt the operation. Then download the tar.gz package for the corresponding JDK, and put it in:/var/cache/oracle-jdk7-installer (JDK7)/var/cache/oracle-jdk8-installer (JDK8)Below, and then install the installer once. Installer will use the TAR.GZ package you downloaded by default3. Set the system default JDKJDk7sudo update-java-alternatives-s java-7-or
..Lrwxrwxrwx. 1 root 16 Oct 13 default->/usr/java/latestDrwxr-xr-x. 9 root 4096 Oct 13 jdk1.8.0 _ 20Lrwxrwxrwx. 1 root 21 Oct 13 latest->/usr/java/jdk1.8.0 _ 20 However, it is not actually used so far. We need to use the alternative tool to manage it. For soft links, if we direct the configuration content to/usr/java/default/bin/xxx and install jdk 1.9 or 2.0 in the future, you just need to directly modify the soft link, instead of having to do it again. therefore, I will use/usr/java/default/a
Untu3.3 )... setting libmagickcore4 (8: 6. 6.9.7-5ubuntu3. 3 )... setting libmagickwand4 (8: 6. 6.9.7-5ubuntu3. 3 )... setting imagemagick (8: 6. 6.9.7-5ubuntu3. 3 )... setting libmagickcore4-extra (8: 6. 6.9.7-5ubuntu3. 3 )... setting libnetpbm10. 0-15 )... setting libqt4-declarative-gestures (4: 4. 8.1-0ubuntu4. 6 )... setting libqt4-declarative-particles (4: 4. 8.1-0ubuntu4. 6 )... setting qt4-linguist-tools (4: 4. 8.1-0ubuntu4. 6 )... update -Alternativ
Recently installed in Ubuntu16.04 python3.5 and the system comes with the python2.7.13, summarize the different versions of the switching problem. Alias: Aliases BASHRC: Personal Profile First, modify the Python version (for users)To modify a Python version for a particular user, simply create one (alias) in its home directory alias . Open the user's ~/.bashrc file and add the new alias information to modify the Python version that is used by default.Alias python= '/usr/bin/pyt
the TAR.GZ package you downloaded by default3. Set the system default JDKJDK8sudo update-java-alternatives-s java-8-oracleIf the JDK7 is installed and the JDK8 is installed, to switch between the two, you can:JDK8 Switch to Jdk7sudo update-java-alternatives-s java-7-oracleJDK7 Switch to Jdk8sudo update-java-alternatives-s java-8-oracle4. Test whether the JDK was
ubuntu 16.04本身是自带python的，他本身是自带2.X和3.X,两个版本，默认的是2.X。这里记录一下如果在版本间切换以及如何把python版本切换到3.X下的方法。1. See the version of Python installed in Ubuntu and the Python version currently in useLs/usr/bin/python*python--version2. Set Update-alternatives to toggle Python versionShow python in place of version informationUpdate-alternatives--list pythonShow after executionUpdate-alternatives:error:no
First install sun1.6, here I install the directory is/usr/java/jdk1.6.0_45 Then set the profile file/etc/profile (add the file at the end of the file) sudo vim/etc/profile Export java_home=/usr/java/jdk1.6.0_45 export jre_home=/usr/java/jdk1.6.0_45/jre export classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar export path= $PATH: $JAVA _home/bin Source/etc/profile Then install openjdk1.7, you can install it in Software Center, and then execute the following command after installat
Tags: ons file permissions maintenance Ali awt install Oracle ISP download systemDeepin System Manual Installation Oracle Jdk8 detailed tutorialsDownload the JDK archive from Oracle website and extract the files using sudo tar-zxf jdk***, which I placed under the HOME/DIY/JAVA/JDK path.JDK file path:/home/diy/java/jdk/jdk1.8.0_152JDK environment variable ConfigurationModifying a configuration filesudo vi/etc/profileAfter entering, knock on I, then you can edit the content.Add content at the end
1. Install NVIDIA Drive./nvidia-linux-x86_64-384.69.runNvidia-smi success indicates driver OK2. Installing CudaDpkg-i Cuda-repo-ubuntu1404-8-0-local-ga2_8.0.61-1_amd64.debApt-get UpdateApt-get Install CudaInstall PATCH2 (can also not be installed) Dpkg-i Cuda-repo-ubuntu1404-8-0-local-cublas-performance-update_8.0.61-1_amd64.deb3. Reduce the GCC version to less than 5.0 (ubuntu-14 not required because it is already gcc-4.8.4,ubuntu-16)sudo apt-get install g++-4.9sudo update-
,Then enter in the above type to search: Additional drivers Open "Additional drivers--additional Driver" and select the NVIDIA driver that matches your graphics card, and here I amUsing Nvidia binary drivers (375)Then choose Apply Changes, where the installation may fail, at which point you can continue to choose to apply the changes, install multiple timesWhen the installation is complete, select restart4. GCC down versionCUDA8.0 does not support GCC 5.0 and above compilers, and the system come
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