Ubuntu bash脚本:如何用最后一个斜杠分割路径?

我有一个文件(例如称为list.txt)，其中包含文件的相对路径，每行一个路径，即类似这样的内容:

I have a file (say called list.txt) that contains relative paths to files, one path per line, i.e. something like this:

foo/bar/file1
foo/bar/baz/file2
goo/file3

我需要编写一个bash脚本，该脚本一次处理一个路径，在最后一个斜杠处将其拆分，然后启动另一个进程，将路径的两个部分作为参数提供给它.到目前为止，我只有循环部分:

I need to write a bash script that processes one path at a time, splits it at the last slash and then launches another process feeding it the two pieces of the path as arguments. So far I have only the looping part:

for p in `cat list.txt`
do
   # split $p like "foo/bar/file1" into "foo/bar/" as part1 and "file1" as part2
   inner_process.sh $part1 $part2
done

如何拆分?当路径没有斜杠时，这种方法在退化的情况下会起作用吗?

How do I split? Will this work in the degenerate case when path has no slashes?

Thx