您可以检查一个目录是空的是这样的：

You can check if a directory is empty like this:

#!/bin/sh
target=$1
test "$(ls -A "$target" 2>/dev/null)" || echo The directory $target is empty

或者更好的是：

#!/bin/sh
target=$1
if test "$(ls -A "$target")"; then
    echo not empty, do something
else
    echo The directory $target is empty '(or non-existent)'
fi

更新

如果该目录包含多个文件，这可以是慢。在这种情况下，这应该是较快

UPDATE

If the directory contains many files, this can be slow. In that case, this should be faster:

#!/bin/sh
target=$1
if find "$target" -mindepth 1 -print -quit | grep -q .; then
    echo not empty, do something
else
    echo The directory $target is empty '(or non-existent)'
fi

的找到命令将打印并退出发现里面的第一个文件或目录$目标之后。在的grep -q。将成功退出只有当找到打印任何东西，换句话说，如果有任何文件。

The find command will print and quit after it finds the first file or directory inside $target. The grep -q . will exit with success only if the find printed anything, in other words, if there were any files.