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18.04
java
environment-variables
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URL:
https://askubuntu.com/q/1131572
Title:
Can't remove environmental variable in Ubuntu 18.04
ID:
/2019/04/06/Can_t-remove-environmental-variable-in-Ubuntu-18.04
Created:
April 6, 2019
Edited: April 6, 2019
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September 15, 2024
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$JAVA_HOME will already have a definition on many systems without explicitly declaring it in /etc/environment:
$ echo $JAVA_HOME
/usr/lib/jvm/java-8-oracle
That said, the unset command will eliminate a variable. From: Unix / Linux - Using Shell Variables
##Unsetting Variables
Unsetting or deleting a variable directs the shell to remove the
variable from the list of variables that it tracks. Once you unset a
variable, you cannot access the stored value in the variable.Following is the syntax to unset a defined variable using the unset
command −unset variable_nameThe above command unsets the value of a defined variable. Here is a
simple example that demonstrates how the command works −#!/bin/sh NAME="Zara Ali" unset NAME echo $NAME
In our case we can use:
$ echo $JAVA_HOME
/usr/lib/jvm/java-8-oracle
───────────────────────────────────────────────────────────────────────────────────────────
$ unset JAVA_HOME
───────────────────────────────────────────────────────────────────────────────────────────
$ echo $JAVA_HOME
───────────────────────────────────────────────────────────────────────────────────────────
$