linux shell 条件判断

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linux shell 条件判断

(1)是否等于

if [ x"$1" == x"a" ];then
    echo right
else
    echo wrong
fi

 

(2)多重条件

#!/bin/bash
score=$1
if [ $score = 5 ]||[ $score = 3 ];then
    echo right
else
    echo wrong
fi

 

#!/bin/bash
score=$1
if [ $score -gt 5 ]||[ $score -lt 3 ];then
    echo right
else
    echo wrong
fi

 

(3)elseif

scores=84;
if [[ $scores -gt 90 ]]; then
    echo "very good!";
elif [[ $scores -gt 80 ]]; then
    echo "good!";
elif [[ $scores -gt 60 ]]; then
    echo "pass!";
else
    echo "no pass!";
fi;


JAVA_OPTS=" -Djava.awt.headless=true -Djava.net.preferIPv4Stack=true "
JAVA_DEBUG_OPTS=""
if [ "$1" = "debug" ]; then
    JAVA_DEBUG_OPTS=" -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n "
elif [ "$1" = "swing" ]; then
    JAVA_OPTS=" -Djava.net.preferIPv4Stack=true "
    APP_MAINCLASS=org.fengfei.lanproxy.client.swing.ClientApp
fi