在bash脚本中包含java -version命令

Question

[Message updated to include script and its output as you asked].

I have created a linux script which installs Oracle Java on Ubuntu.

The script is the following:

#!/bin/bash
# This script installs Oracle Java 7u51 jdk on Ubuntu Linux 64 bit

echo "Starting Oracle Java JDK Installation..."
sudo mkdir /usr/local/java
cd
sudo cp -r jdk-7u51-linux-x64.tar.gz /usr/local/java
rm jdk-7u51-linux-x64.tar.gz
cd /usr/local/java

echo "Unpacking java files in /usr/local/java"
sudo tar xvzf jdk-7u51-linux-x64.tar.gz
sudo rm jdk-7u51-linux-x64.tar.gz
sleep 1s

echo "Updating system Path file /etc/profile with Java variables"
sudo sed -i '$ a\JAVA_HOME=/usr/local/java/jdk1.7.0_51' /etc/profile
sudo sed -i '$ a\PATH=$PATH:$HOME/bin:$JAVA_HOME/bin' /etc/profile
sudo sed -i '$ a\export JAVA_HOME' /etc/profile
sudo sed -i '$ a\export PATH' /etc/profile
sleep 1s

echo "Updating alternatives"
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/
jdk1.7.0_51/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/
jdk1.7.0_51/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/
jdk1.7.0_51/bin/javaws" 1
sudo update-alternatives --set java /usr/local/java/jdk1.7.0_51/bin/java
sudo update-alternatives --set javac /usr/local/java/jdk1.7.0_51/bin/javac
sudo update-alternatives --set javaws /usr/local/java/jdk1.7.0_51/bin/javaws
sleep 3s

echo "Reload system wide Path /etc/profile"
. /etc/profile
sleep 3s

echo "Testing if Java is installed correctly. System must reply with Java version."
java –version
sleep 1s
javac -version

The script runs fine doing its thing and Java is installed correctly. But the java -version command at the end gives this output at the terminal.

Two things baffle me. The first is that the javac -version commands works in the script but not the java -version command.

The second is that if I go to the terminal right after the script has ended and input myself java -version, it works.

Answer 1

The install may be adding to the PATH, which you won't see from inside the current shell. Try it with

sh -c java -version

Answer 2

也许您可以更改调用顺序，也可以在更新替代操作之前调用重装系统范围的Path操作。