检查目录是否用 bash 挂载 [英] Check if directory mounted with bash

问题描述

我正在使用

mount -o bind /some/directory/here /foo/bar

我想用 bash 脚本检查 /foo/bar，看看它是否已经挂载?如果不是，则调用上面的 mount 命令，否则执行其他操作.我该怎么做?

I want to check /foo/bar though with a bash script, and see if its been mounted? If not, then call the above mount command, else do something else. How can I do this?

CentOS 是操作系统.

CentOS is the operating system.

推荐答案

运行不带参数的 mount 命令将告诉您当前的安装.在 shell 脚本中，您可以使用 grep 和 if 语句检查挂载点:

Running the mount command without arguments will tell you the current mounts. From a shell script, you can check for the mount point with grep and an if-statement:

if mount | grep /mnt/md0 > /dev/null; then
    echo "yay"
else
    echo "nay"
fi

在我的示例中，if 语句正在检查 grep 的退出代码，它指示是否存在匹配项.由于我不希望在匹配时显示输出，因此我将其重定向到 /dev/null.

In my example, the if-statement is checking the exit code of grep, which indicates if there was a match. Since I don't want the output to be displayed when there is a match, I'm redirecting it to /dev/null.

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