I want to remove java5 completely from my ubuntu 11.04 system. On executing java -version, it showing -
java version "1.5.0"
gij (GNU libgcj) version 4.4.5
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
How can I remove it?
If you want to remove completely that java version you need to remove the packages that contain it, see a list of packages with:
sudo dpkg --get-selections | grep jre
In this way you see what jre packages you've installed. Then you can remove the packages with:
sudo apt-get remove old_jre_package
Anyway a better solution is to make more JDK versions coesist, in Ubuntu is easy to do it. You can use the update-alternatives command. So you can install another JDK and switch between the jdk versions with the alternative tools:
sudo update-alternatives --config java
sudo update-alternatives --config javac
For more options see the man page man update-alternatives.
You can search all the jre package in your system by running this command
sudo aptitude search jre
Remove it using this command
sudo apt-get remove sun-java6-jre sun-java6-plugin sun-java6-fonts
You can also try this command to remove all the java files in your system
sudo aptitude remove '~njava'
You should try script oab java.
Yes the better solution is to make more JDK versions by using "update-alternatives" command.
After that you can also set PATH using the command.
export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_11 or /usr/lib/jvm/jdk1.6.0_38
export PATH=$JAVA_HOME/bin:$PATH
Related
For example on el7:
to develop an nvidia CUDA application you need a newer gcc than the default gcc version 4.8.x and to get the newer version you would use a software repo called "Software Collections" (SCL)
the base python3 is 3.6 and you need newer python modules and so you install python3.8 from SCL
Starting on el8, and el9: the SCL is deprecated and so there is a different method for installing and configuring newer versions of gcc and python3.
On el8/el9/newer, how do you get newer versions of software like python3, gcc, java, etc?
in a nutshell, here are some examples for how to install and configure
for python3 to get python3.9: dnf install -y python39 && alternatives --set python3 $(command -v python3.9)
for gcc to get gcc-12: dnf install gcc-toolset-12 && source scl_source enable gcc-toolset-12
for java to get java-17: dnf install java-17 && bin_java_filename=$(rpm -qa|grep java-17|xargs rpm -ql|grep "bin\/java$"|head -1) && alternatives --set java ${bin_java_filename}
tested on rocky8, rocky9
which repo has the newer software versions?
the old method using "SCL" was deprecated
the new method is to use a repo called "appstream"
here is a post written by the distro maintainers explaining the change https://developers.redhat.com/blog/2018/11/15/rhel8-introducing-appstreams
the repo is enabled by default
how to: install newer software versions?
for python3: dnf install python39
for gcc: dnf install gcc-toolset-12
how to: change the system default?
for python3: alternatives --set python3 $(command -v python3.9)
for gcc:
edit your user .bashrc or .bash_profile or create a new file under /etc/profile.d/ with the following: source scl_source enable gcc-toolset-12
i thought scl_source would go away in el8, el9 but apparently not
for more info on scl_source go to this link https://unix.stackexchange.com/a/195219/5510 or Permanently enable RHEL scl
p.s. what is the difference between alternatives and update-alternatives?
the original tool is called update-alternatives and is from Debian linux distro
in EnterpriseLinux, Redhat rewrote the tool and called it alternatives and when you install alternatives the package also installs a symlink with name update-alternatives on your env var PATH to help you find the tool
the two are similar but not the same because their source code is different
I am using CentOS Linux release 7.3.1611 which has gcc 4.8.5 20150623 installed. I am looking for a way to install a newer version of gcc, specially 8.1. I found the following site on how to install gcc v7 link 1 which describes how to install gcc v7 (using devtoolset-7-gcc*). I did follow the guidelines and was able to install gcc v7. Though, if I followed the same procedure, but used "devtoolset-8-gcc*" instead the return message states "No package devtoolset-8-gcc* available.".
Performed a search and found a page called "Information for build devtoolset-8-gcc-8.1.1-4.el6" link 2, but not sure how to install this. I believe I would need to download the rpm source, compile/build the source, then finally install it.
Basically, I am looking for a easy way to install gcc v8 just like using the method described on link 1.
Thanks in advance.
To install the full tools-set including gfortran on centos 7:
yum install centos-release-scl
yum install devtoolset-8
scl enable devtoolset-8 -- bash
enable the tools:
source /opt/rh/devtoolset-8/enable
you may wish to put the command above in .bash_profile
ref:
https://unix.stackexchange.com/questions/477360/centos-7-gcc-8-installation
devtoolset-8 was only released a short while ago. The linked installation instructions may be of use. However, your question pertains to CentOS, and this does not yet appear to have been made available yet. You can see some evidence of it being build for CentOS here, but it's not been updated for the final release yet.
You could ask on the SCL mailing list for an ETA, or wait until it appears in its final form. In the meantime, you could download the RPMs from koji directly.
The follows worked in centos/rhel 7.
How to install it?
# rpm -ivh http://mirror.centos.org/centos/7/extras/x86_64/Packages/centos-release-scl-rh-2-3.el7.centos.noarch.rpm
# yum install devtoolset-8
Here is the rpm from http://mirror.centos.org/centos/7/extras/x86_64/Packages/ that might be needed to be updated accordingly.
How to use it?
$ scl enable devtoolset-8 bash
$ gcc --version
gcc (GCC) 8.3.1 20190311 (Red Hat 8.3.1-3)
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
The flags -std=c++17 -lstdc++fs and the following line could be helpful.
#include <experimental/filesystem>
I want to uninstall my gcc by terminal. When I type
gcc --version
The output is
gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Could anyone help me? How can I install the last version of gcc after that?
Use the following command (Replace <version> with the appropriate version):
sudo apt-get --purge remove gcc-<version>
You can install a specific version of a program using apt, you can use the following command. (Replace <version> with the appropriate version)
sudo apt-get install gcc=<version>
Alternatively, you can use Synaptic Package Manager.
sudo apt-get update
sudo apt-get install synaptic
Note that, you might need GCC for some programs. If you face any driver issues while installing programs / drivers you can install the latest GCC by using:
sudo apt-get install gcc
I am new to Linux (new as in installed it yesterday), I need it for my programming course in the university and I've been told to install specific versions of specific programs, but though I've used apt-get install to install them (having previously done apt-get update) they aren't in the correct version.
The programs that I need are make 4.0 and valgrind 3.10.1.
apt-get installs make 3.81 and valgrind 3.10.0.SVN.
I have tried typing "apt-get install make4.0" and "apt-get install valgrind10.3.1" to no avail. I have downloaded them from the internet and followed what instructions I could understand to install the newer versions but it keeps saying that I have the older ones. (I'm not sure if I can post direct links here, if I can let me know and I'll post where I got them from).
What have I been doing wrong? How can I fix this?
I am currently running Linux Mint.
Thanks for any answer in advance.
Due to a long-standing unresolved Debian bug report, GNU Make remained the age-old 3.81 in Debian for a very long time, and as a consequence, in Debian-based distributions such as Ubuntu and Mint.
The latest Debian release, Jessie, has upgraded to 4.0, so Debian-based distributions will have that upgrade. However, it is better to use 4.1.
This has been discussed many times on the GNU Make mailing list and elsewhere.
So to get a newer version, you must compile it from scratch.
This is easy:
Install the required packages (gcc, make and such).
Open up a shell (if you're using the GUI, a terminal window).
Type the following commands (or something equivalent, e.g. you can use curl instead of wget):
cd /tmp
wget http://ftp.gnu.org/gnu/make/make-4.1.tar.gz
tar xvf make-4.1.tar.gz
cd make-4.1/
./configure
make
sudo make install
cd ..
rm -rf make-4.1.tar.gz make-4.1
Now, make 4.1 is in /usr/local/bin/make.
You can verify it is there with whereis make.
You can make it your default make by prefixing /usr/local/bin to your $PATH variable in your shell startup file; for instance, in .profile or .bashrc if you use the bash shell.
Don't try to install a self-compiled make (or anything else that doesn't come from the distribution's package manager) into /bin or /usr/bin; doing that will confuse your package manager.
Is there any apt-get-like program for use with Cygwin?
I already tried cyg-apt but when I try I get this error:
cyg-apt: downloading: http://cygwin.mirrors.pair.com/setup-2.bz2
cyg-apt: downloading: http://cygwin.mirrors.pair.com/setup-2.ini
cyg-apt: bad URL http://cygwin.mirrors.pair.com/setup-2.ini, exiting.
Best I have ever used:
apt-cyg package manager
You can do this using Cygwin’s setup.exe from Windows command line. Example:
cd C:\cygwin64
setup-x86_64 -q -P wget,tar,gawk,bzip2,subversion,vim
For a more convenient installer, you may want to use the
apt-cyg package manager. Its syntax is
similar to apt-get, which is a plus. For this, follow the above steps and then
use Cygwin Bash for the following steps:
wget rawgit.com/transcode-open/apt-cyg/master/apt-cyg
install apt-cyg /bin
Now that apt-cyg is installed. Here are a few examples of installing some
packages:
apt-cyg install nano
apt-cyg install git
apt-cyg install ca-certificates
Update: you can read the more complex answer, which contains more methods and information.
There exists a couple of scripts, which can be used as simple package managers. But as far as I know, none of them allows you to upgrade packages, because it’s not an easy task on Windows since there is not possible to overwrite files in use. So you have to close all Cygwin instances first and then you can use Cygwin’s native setup.exe (which itself does the upgrade via “replace after reboot” method, when files are in use).
apt-cyg
The best one for me. Simply because it’s one of the most recent. It works correctly for both platforms - x86 and x86_64. There exists a lot of forks with some additional features. For example the kou1okada fork is one of improved versions.
Cygwin’s setup.exe
It has also command line mode. Moreover it allows you to upgrade all installed packages at once.
setup.exe-x86_64.exe -q --packages=bash,vim
Example use:
setup.exe-x86_64.exe -q --packages="bash,vim"
You can create an alias for easier use, for example:
alias cyg-get="/cygdrive/d/path/to/cygwin/setup-x86_64.exe -q -P"
Then you can for example install the Vim package with:
cyg-get vim
you can always make a bash alias to setup*.exe files in $home/.bashrc
cygwin 32bit
alias cyg-get="/cygdrive/c/cygwin/setup-x86.exe -q -P"
cygwin 64bit
alias cyg-get="/cygdrive/c/cygwin64/setup-x86_64.exe -q -P"
now you can install packages with
cyg-get <package>
This got it working for me:
curl https://raw.githubusercontent.com/transcode-open/apt-cyg/master/apt-cyg > \
apt-cyg && install apt-cyg /bin
No. The only officially supported tool for downloading and updating Cygwin packages is the setup.exe file you used for the initial install, although that can be invoked with command line arguments to help the process.
From that same page:
The basic reason for not having a more full-featured package manager is that such a program would need full access to all of Cygwin's POSIX functionality. That is, however, difficult to provide in a Cygwin-free environment, such as exists on first installation. Additionally, Windows does not easily allow overwriting of in-use executables so installing a new version of the Cygwin DLL while a package manager is using the DLL is problematic.
You can use Chocolatey to install cyg-get and then install your packages with it.
For example:
choco install cyg-get
Then:
cyg-get install my-package