如何使用Bash Shell检查Java版本？
我对Shell脚本非常陌生。我要检查以下内容：
无论用户是su不是。 如果su那么systemctl命令存在或不存在 如果已安装，则是否安装了Java 如果已安装，则版本是否为1.8或更高 如果更多，那就不是Oracle Java 如果使用Oracle Java，则运行jar 我已经完成以下工作：
#!/bin/bash
if ! [ $(id -u) = 0 ]; then
echo "User not logged in as Root!"
exit 1
fi
if command -v systemctl; then
echo Found systemctl
else
sudo apt-get install systemd
fi
if type java | grep -q 'java' ; then
echo Found java executable in PATH
_java=java
elif [[ -n "$JAVA_HOME" ]] && [[ -x "$JAVA_HOME/bin/java" ]]; then
echo Found java executable in JAVA_HOME
_java="$JAVA_HOME/bin/java"
else
echo "Java is not installed. Please install JAVA 1.8 or upper version"
exit 1
fi
if [ ! -z "$_java" ]; then
version=$("$_java" -version 2>&1 | awk -F '"' '/version/ {print $2}')
echo version "$version"
if [ "$version" > "1.8" ]; then
echo Java version is more than 1.8
if [[ $("$_java" -version 2>&1) != *"Java(TM)"* ]]; then #Problem is here
# if [ $("$_java" -version 2>&1) | grep -q 'Java(TM)' ]; then
echo "Oracle JRE is installed"
java -jar myJar-0.0.1-SNAPSHOT.jar
else
echo "Oracle JRE is not installed" ;
fi
else
echo Java version is less than 1.8
echo "Please install JAVA 1.8 or upper version"
exit 1
fi
else
exit 1
fi 当我执行它时，以下错误来自该行 if [[ $("$_java" -version 2>&1) != "Java(TM)" ]]; then
installNew.sh: 34: installNew.sh: [[: not found
有人可以帮忙吗？
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看看我的整个脚本 https://github.com/darshanpatidar1/Environment-Setup/blob/master/version.sh， 用于检查Java，Python和其他版本
#!/bin/bash #echo "Checking java JDK version" #command -v javac >/dev/null 2>&1 || { echo >&2 "Java JDK is not installed"; } #variables purge_='sudo apt-get purge ' update_='sudo apt update ' install_='sudo apt install ' #checking for java files and exe echo Java JRE - if type -p java; then echo Found Java executable in PATH _java=java elif [[ -n $JAVA_HOME ]] && [[ -x "$JAVA_HOME/bin/java" ]]; then echo Found Java executable in JAVA_HOME _java="$JAVA_HOME/bin/java" else echo "no JRE found" fi if [[ "$_java" ]]; then version=$("$_java" -version 2>&1 | awk -F '"' '/version/ {print $2}') echo Version "$version" fi echo echo Java JDK - if type -p javac; then echo Found Javac executable in PATH _javac=javac elif [[ -n $JAVA_HOME ]] && [[ -x "$JAVA_HOME/bin/javac" ]]; then echo Found Javac executable in JAVA_HOME _javac="$JAVA_HOME/bin/javac" else echo "no JDK found" echo "Previous Java JDK files will also be removed in installation." read -r -p "Do you want to install it now? [y/N] " response if [[ "$response" =~ ^([yY][eE][sS]|[yY])+$ ]] then echo "Installing Java JDK " $purge_ 'java openjdk-*' $update_ $install_ java -y else echo "Installation aborted !" exit fi fi if [[ "$_javac" ]]; then version=$("$_javac" -version 2>&1 | awk '{print $2}') echo Version "$version" fi #javac -version 2>&1 | head -n 1 #end of java2020-01-06 15:23:38赞同 展开评论
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