我使用SH shell，我试图比较一个字符串与变量的值，但if条件总是执行为true。为什么？
这里是一些代码：
Sourcesystem="ABC"
if [ "$Sourcesystem" -eq 'XYZ' ]; then
echo "Sourcesystem Matched"
else
echo "Sourcesystem is NOT Matched $Sourcesystem"
fi;
echo Sourcesystem Value is $Sourcesystem ;
即使这不工作：
Sourcesystem="ABC"
if [ 'XYZ' -eq "$Sourcesystem" ]; then
echo "Sourcesystem Matched"
else
echo "Sourcesystem is NOT Matched $Sourcesystem"
fi;
echo Sourcesystem Value is $Sourcesystem ;
第二，我们可以将其与NULL或空字符串匹配吗？
您应该使用=运算符进行字符串比较：
Sourcesystem="ABC"
if [ "$Sourcesystem" = "XYZ" ]; then
echo "Sourcesystem Matched"
else
echo "Sourcesystem is NOT Matched $Sourcesystem"
fi;
man测试说，你使用-z匹配空字符串。
