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Archives for November 2021

Remove Oracle Java

November 30, 2021

Here’s a script that removes Oracle Java on your system. Installs OpenJDK Hotspot as a replacement.

#!/bin/bash
# set env
oracle_jre_version="jdk1.8.0_172"
open_jre_version="java-1.8.0-openjdk"
# REMOVE LINKS
deljdk () {
	sudo update-alternatives --remove "java" "/usr/lib/jvm/$oracle_jre_version/bin/java"
	sudo update-alternatives --remove "javac" "/usr/lib/jvm/$oracle_jre_version/bin/javac"
	sudo update-alternatives --remove "javaws" "/usr/lib/jvm/$oracle_jre_version/bin/javaws"
}
# REMOVE RPM
delrpm () {
	jdk=$(rpm -qa | grep jdk-1.7)
	rpm -e $jdk
	jdk=$(rpm -qa | grep jdk1.8)
	rpm -e $jdk
	sudo rm -rf /usr/java/jdk*
}
# REMOVE SYMBOLIC LINKS
delsym () {
	rm /usr/java/default /usr/java/latest
	rm /usr/lib/mozilla/plugins/libnpjp2.so
	rm /usr/lib/mozilla/plugins/libnpjp2.so
}
# INSTALL OPENJDK
addjdk () {
	cd /usr/java
	rm -f /usr/java/OpenJDK8U-jdk_x64_linux_hotspot_8u302b08.tar.gz
	wget --no-check-certificate https://10.49.39.125/download/OpenJDK8U-jdk_x64_linux_hotspot_8u302b08.tar.gz
	tar xzf OpenJDK8U-jdk_x64_linux_hotspot_8u302b08.tar.gz
	chown -R username:username /usr/java/jdk8u302-b08
}
# ADD PATH
addpath () {
	sed -i '/jdk8u302-b08/d' /home/username/.zshrc
	sed -i '/jdk8u302-b08/d' /home/username/.profile
	echo 'export PATH=/usr/java/jdk8u302-b08/bin:$PATH' | tee -a ~/.bashrc
	echo 'export PATH=/usr/java/jdk8u302-b08/bin:$PATH' | tee -a /home/username/.zshrc
	echo 'export PATH=/usr/java/jdk8u302-b08/bin:$PATH' | tee -a /home/username/.profile
	chown username:username /home/username/.zshrc
	chown username:username /home/username/.profile
}
deljdk
delrpm
delsym
addjdk
addpath

#!/bin/bash # set env oracle_jre_version="jdk1.8.0_172" open_jre_version="java-1.8.0-openjdk" # REMOVE LINKS deljdk () { sudo update-alternatives --remove "java" "/usr/lib/jvm/$oracle_jre_version/bin/java" sudo update-alternatives --remove "javac" "/usr/lib/jvm/$oracle_jre_version/bin/javac" sudo update-alternatives --remove "javaws" "/usr/lib/jvm/$oracle_jre_version/bin/javaws" } # REMOVE RPM delrpm () { jdk=$(rpm -qa | grep jdk-1.7) rpm -e $jdk jdk=$(rpm -qa | grep jdk1.8) rpm -e $jdk sudo rm -rf /usr/java/jdk* } # REMOVE SYMBOLIC LINKS delsym () { rm /usr/java/default /usr/java/latest rm /usr/lib/mozilla/plugins/libnpjp2.so rm /usr/lib/mozilla/plugins/libnpjp2.so } # INSTALL OPENJDK addjdk () { cd /usr/java rm -f /usr/java/OpenJDK8U-jdk_x64_linux_hotspot_8u302b08.tar.gz wget --no-check-certificate https://10.49.39.125/download/OpenJDK8U-jdk_x64_linux_hotspot_8u302b08.tar.gz tar xzf OpenJDK8U-jdk_x64_linux_hotspot_8u302b08.tar.gz chown -R username:username /usr/java/jdk8u302-b08 } # ADD PATH addpath () { sed -i '/jdk8u302-b08/d' /home/username/.zshrc sed -i '/jdk8u302-b08/d' /home/username/.profile echo 'export PATH=/usr/java/jdk8u302-b08/bin:$PATH' | tee -a ~/.bashrc echo 'export PATH=/usr/java/jdk8u302-b08/bin:$PATH' | tee -a /home/username/.zshrc echo 'export PATH=/usr/java/jdk8u302-b08/bin:$PATH' | tee -a /home/username/.profile chown username:username /home/username/.zshrc chown username:username /home/username/.profile } deljdk delrpm delsym addjdk addpath

Filed Under: Linux Tagged With: delete, java, oracle, remove

Git Clone Multiple Accounts

November 28, 2021

How to clone repositories with multiple Github accounts.

git clone git@github.com-yourgitaccount:yourgitaccount/myrepo.git

git clone git@github.com-yourgitaccount:yourgitaccount/myrepo.git

Filed Under: Linux Tagged With: accounts, clone, git, multiple, repo

GCP Spot Instance

November 25, 2021

You can save anywhere from 60-91% using a spot instance. The downside is, the instance can be preempted anytime.

Create a spot instance.

gcloud beta compute instances create spot-example \
--provisioning-model=SPOT \
--instance-termination-action=STOP \
--image-project=ubuntu-os-cloud \
--image-family=ubuntu-2004-lts \
--machine-type=e2-micro \
--project=your-project-id \
--zone=us-central1-a

gcloud beta compute instances create spot-example \ --provisioning-model=SPOT \ --instance-termination-action=STOP \ --image-project=ubuntu-os-cloud \ --image-family=ubuntu-2004-lts \ --machine-type=e2-micro \ --project=your-project-id \ --zone=us-central1-a

Delete instance.

gcloud compute instances delete spot-example \
--project=your-project-id \
--zone=us-central1-a

gcloud compute instances delete spot-example \ --project=your-project-id \ --zone=us-central1-a

Filed Under: Cloud Tagged With: create, delete, gcp, instance, preempted, spot

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