bash - Bash脚本: 'Syntax error: “fi” unexpected' within nested statement

Question

我正在尝试编写脚本来切换HAproxy，以便在服务关闭时将用户重新路由到维护页面。这是我遇到的问题:

if [ "$idIsValid" = "false" ]; then
    if [ "$(cat isUp)" = "true" ]; then
            echo "Site is down! Routing to maintenance page."
            echo false > isUp
            mv haproxy.cfg haproxy.cfg.temp
            mv haproxy.cfg.other haproxy.cfg
            mv haproxy.cfg.temp haproxy.cfg.other

            #restart haproxy
            service haproxy restart
            echo "Restarting HAproxy"

    elif [ "$(cat isUp)" = "false" ]; then
            #do nothing since it has already changed
            echo "Nothing to do; service is still down."
    else
            #notify me that isUp is set to something other than true or false, or something else is wrong.
    fi
fi

运行此命令时，出现错误:

status-check.sh: Syntax error: "fi" unexpected

此错误指向倒数第二行上的 嵌套fi 。我在这里找不到语法错误。请协助!谢谢。

Answer 1

这是因为最后一个else块中没有命令。如果删除该块或在其中放置命令(而不是注释)，则不会出现语法错误。