You can use the LS command to see that Python binaries are available in your system as follows.
$ ls/usr/bin/python*
/usr/bin/python/usr/bin/python2/usr/bin/python2.7/usr/bin/python3/usr/bin/python3.4/ usr/bin/python3.4m/usr/bin/python3m
Perform the following command to view the default Python version information:
$ python--version
python 2.7.8
1. Modify Python version based on User:
To modify the Python version for a particular user, simply create an alias (alias) und
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 JDK7 is installed and the JDK8 is
. After the installation is complete, verify that[Email protected] ~]# java-"1.6.0_37"1.13. 9) (rhel-1.13. 9.4. el5_11-23.25-b01, Mixed mode)4. The path to the default installation via Yum is/usr/lib/jvm[Email protected] ~]# cd/usr/lib/Jvm[[email protected] jvm]# lltotal -drwxr-xr-x3Root root4096Jan A -: onjava-1.6.0-openjdk-1.6.0.37. x86_64lrwxrwxrwx1Root root +Jan A -: onJRE-/etc/alternatives/jrelrwxrwxrwx1Root root -Jan A -: onjre-1.6.0/etc/
It has been installed several times before, but each time you need to install again and have to re-search the tutorial, to record their own to avoid forgetting.Install JDK DownloadDownload: Click to open the link, I downloaded the filename is jdk-8u66-linux-x64.tar.gzUnzip the installationI'm going to install it under/opt/jvm/.First extract, TAR-ZXVF jdk-8u66-linux-x64.tar.gz, get jdk1.8.0_66Rename and move to/OPT/JVM,mv jdk1.8.0_66/jdk1.8/ mv jdk1.8.0_66//opt/jvm/Setting Environment Variablese
In Ubuntu, if you have more than one Java version installed (sometimes some software installs itself), how can you easily switch? In addition to the common settings environment variables, today learned a new way to switch:Update-alternatives--config JavaUpdate-alternatives--config JavacAlso, how to install your own Java version:sudo update-alternatives--install/u
When you install Debian Linux, the installation process may also provide you with multiple Python versions available, so there will be multiple Python executable binaries in the system. You can use the LS command to see that Python binaries are available in your system as follows.
$ ls/usr/bin/python*
/usr/bin/python /usr/bin/python2 /usr/bin/python2.7 /usr/bin/python3 / usr/bin/python3.4 /usr/bin/python3.4m /usr/bin/python3m
Perform the following command to view the default Python vers
Blockchain Enthusiast (qq:53016353)
#数字货币创世块留言
This is widely circulated in Nakamoto in the digital money creation block Coinbase write down "The Times 03/jan/2009 Chancellor on brink of second bailout for banks" This sentence is the first page of the day's headline article title, such as Under
The value of Coinbase is
"Coinbase": " 04ffff001d01044554
Create a Python development environment in Ubuntu13.10: Step 1 install JDK (to install ECLIPSEIDE) decompress the installation package and set JDK. The update-alternatives -- install option feature adds a new set of system command links. Tar-zxvfjdk-7u45-linux-x64.tar.gzsudomkdir-p/usr/lib/jvmsudomv./j
Build a Python development environment in Ubuntu 13.10:
Step 1 install JDK (to install eclipse ide)
Decompress the installation package and set JDK.
Th
/controlpanelIcon =/usr/lib/Java/JRE/plugin/desktop/sun_java.pngTerminal = 0Type = ApplicationCategories = application; settings; X-sun-supported; X-red-hat-base;
In this way, you can start the Java console through the menu...
3. Use alternatives to run all Java commands, man, and plugin.Finally, create a link for the command under JDK bin, install the plug-in for Mozilla, and create a shell file with the following content:
#! /Bin/bash
+ F7 to return to the desktop.Another point is that when you configure the environment, do not leave spaces between the Environment name and the corresponding environment path, such as JAVA_HOME =/opt/jdk1.7.0 _ 45 "=" on both sides, which should be unrecognized by bash.4. Because ubuntu comes with the JVM Implementation of gij, the following information is displayed when you type "java-version" on the terminal: java version "1.6.0. This means that the JVM implementation is already available in
ubuntu16.04 python2.7 and python3.5 are installed by default. This tutorial uses python3.5The first step: Modify the default ubuntu16.04 Python2 to use Python3 by default.sudo update-alternatives--install/usr/bin/python python/usr/bin/python2 100sudo update-alternatives--install/usr/ Bin/python Python/usr/bin/python3 150Running the above code will modify ubuntu16.04 by default using Python2 to use Python3 b
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-oracleJDK8sudo update-java-alternatives
1, download the installation package, CD to the directory where the filessudo dpkg-i gcc41-compat-4.1.2-ubuntu1210_i386.deb g++41-compat-4.1.2_i386.deb2. View GCC installed to the systemls/usr/bin/gcc*3.After downloading the package, it is recommended to install it directly with sudo dkpg-i *.debBecause GCC installs with each other version of support, there are very frustrating order requirements, as if the installation system will automatically arrange the order of installation, more convenient
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-oracleJDK8sudo update-java-alternatives
Error:kernel launches from templates is not allowed in System files 1
error detected in the compilation of "/tmp/tmp Xft_00005657_00000000-10_math_functions.cpp4.ii ".
Workaround :
g++ version is too high in Ubuntu14.04, Ubuntu15.04 is normal
sudo apt-get install gcc-4.6 g++-4.6 gcc-4.6-multilib g++-4.6-multilib
sudo update-alternatives--remove-all gcc
sudo update-alternatives--remove-all g++
sudo upda
Preparation: JBoss, JDK, a Java EE War pack, DockerfileNote: JBoss and JDK can not be prepared in advance, wget in the command, because I happen to have, directly copiedDockerfile content:#admln 20150120From ubuntu:14.04Maintainer admln RUN Mkdir/usr/jbossCOPY wildfly-8.2.0.final/usr/jboss/COPY javaeedocker.war/usr/jboss/standalone/deployments/RUN mkdir/usr/java/COPY jdk-7u71-linux-x64.tar.gz/usr/java/workdir/usr/java/RUN TAR-ZXF jdk-7u71-linux-x64.tar.gzRUN update-
= $PATH: $JAVA _home/bin:$ Classpathexport PATH
Note the path and version of the JDK
Make configuration effective
Source/etc/profileConfiguring the default JDK
Create a new Java version
Create a new system command link in the shell with the update-alternatives command:sudoUpdate-alternatives--Install/usr/bin/javac Javac/usr/lib/jvm/jdk1.7.0_79/bin/javac1171sudoUpda
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