Alternatives: Difference between revisions

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=Internal=
=Internal=
* [[Linux#Commands|Linux]]
* [[Linux#Commands|Linux]]
* [[Java on Linux]]


=Overview=
=Overview=
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<syntaxhighlight lang='bash'>
<syntaxhighlight lang='bash'>
alternatives
alternatives
</syntaxhighlight>
=Obtain the Alternatives for an Executables=
<syntaxhighlight lang='bash'>
alternatives --display java
alternatives --display java | grep priority
</syntaxhighlight>
The output contains the "alternatives" - which include the full path of the executable and a priority.
=Set an Alternative Interactively=
<syntaxhighlight lang='bash'>
alternatives --config java
</syntaxhighlight>
=Set an Alternative Non-Interactively=
One way of setting an alternative java installation is with <code>--set</code>.
<syntaxhighlight lang='bash'>
alternatives --set java /usr/lib/jvm/java-1.8.0-amazon-corretto/jre/bin/java
</syntaxhighlight>
The exact path can be obtained with [[#Obtain_the_Alternatives_for_an_Executables|--display]]. The command is sensitive to the exact absolute path of the "alternative" executable.
On occasions, <code>alternatives --set</code> fails:
<font size='-1'>
alternatives --set java  /usr/lib/jvm/amazon-corretto-8.292.10.1-linux-x64/bin/java
/usr/lib/jvm/amazon-corretto-8.292.10.1-linux-x64/bin/java <font color=red>has not been configured</font> as an alternative for java
</font>
In that situation, an alternative installation method is:
<syntaxhighlight lang='bash'>
cd /usr/lib/jvm/
tar tfvz amazon-corretto-8-x64-linux-jdk.tar.gz
alternatives --install /usr/bin/java java /usr/lib/jvm/amazon-corretto-8.292.10.1-linux-x64/bin/java 10
</syntaxhighlight>
</syntaxhighlight>

Latest revision as of 23:41, 25 June 2021

Internal

Overview

alternatives

Obtain the Alternatives for an Executables

alternatives --display java
alternatives --display java | grep priority

The output contains the "alternatives" - which include the full path of the executable and a priority.

Set an Alternative Interactively

alternatives --config java

Set an Alternative Non-Interactively

One way of setting an alternative java installation is with --set.

alternatives --set java /usr/lib/jvm/java-1.8.0-amazon-corretto/jre/bin/java

The exact path can be obtained with --display. The command is sensitive to the exact absolute path of the "alternative" executable.

On occasions, alternatives --set fails:

alternatives --set java  /usr/lib/jvm/amazon-corretto-8.292.10.1-linux-x64/bin/java
/usr/lib/jvm/amazon-corretto-8.292.10.1-linux-x64/bin/java has not been configured as an alternative for java

In that situation, an alternative installation method is:

cd /usr/lib/jvm/
tar tfvz amazon-corretto-8-x64-linux-jdk.tar.gz
alternatives --install /usr/bin/java java /usr/lib/jvm/amazon-corretto-8.292.10.1-linux-x64/bin/java 10