a script for installing jdk from tar file in Ubuntu

install_jdk.sh

#!/usr/bin/env bash

if [[ $# != 1 ]]; then
    echo -e "usage:\t$0 <url of Linux binary from https://jdk.java.net>"
    exit 1
fi

if [ $EUID != 0 ]; then
    sudo "$0" "$@"
    exit $?
fi

JAVA_URL=$1
JAVA_TAR_NAME=${JAVA_URL/*\//}
JAVA_FULL_NAME=${JAVA_TAR_NAME/_bin.tar.gz/}
JAVA_NAME=${JAVA_FULL_NAME/_*/}
JAVA_NAME=${JAVA_NAME/open/}
JAVA_HOME_PREF=/opt/java
JAVA_HOME=$JAVA_HOME_PREF/$JAVA_NAME
TMP_DIR=/tmp/java
JAVA_PRIORITY=20${JAVA_NAME/*-/}

RED="\033[31m"
GREEN="\033[32m"
YELLOW="\033[33m"
B="\033[1;4m"
NC="\033[0m"

echo -e "${YELLOW}${B}Intstalling Java${NC}"
echo -e "${YELLOW}version${NC}:\t"$JAVA_FULL_NAME
echo -e "JAVA_HOME${RED}=${NC}$JAVA_HOME"
echo ""

mkdir -p $TMP_DIR
pushd $TMP_DIR >/dev/null

[[ -f $JAVA_TAR_NAME ]] || curl -O $JAVA_URL
[[ -d $JAVA_HOME ]] || tar -xzvf $JAVA_TAR_NAME -C $JAVA_HOME_PREF

for bin in "java" "javac"; do
    update-alternatives --install /usr/bin/${bin} ${bin} ${JAVA_HOME}/bin/${bin} ${JAVA_PRIORITY}
done

echo ""

echo -e "${GREEN}java${NC}"
java --version

echo -e "${GREEN}javac${NC}"
javac --version

echo -e "${GREEN}maven${NC}"
mvn --version

popd >/dev/null