Question: I'm using the Perl rename command line tool to search recursively through a directory to rename any directories as well as files it finds. The issue I'm running into is the rename command will rename a sub-directory of a file then attempt to rename the parent directory of the same file. This will fail because the sub-directory has been renamed resulting in a "No such file or directory"

Command:

```
rename -f 's/foo/bar/' **
rename -f 's/Foo/Bar/' **

```

For example, here is an original file that I would like to replace 'foo' with 'bar'

File:

```
/test/foo/com/test/foo/FooMain.java

```

Failure:

```
Can't rename /test/foo/com/test/foo/FooMain.java /test/bar/com/test/foo/FooMain.java: No such file or directory

```

Preferred File:

```
/test/bar/com/test/bar/BarMain.java

```

You can see from the error message that it's attempting to rename the parent directory but at that point the subdirectory has already been changed resulting in the file not found error. Is there parameters for the rename command that will fix this or do I need to go about this in a different way?

Answer: 
I would go about this in a different way - specifically, using a depth-first search in place of the shell globstar `**`

For example, using GNU `find`, given:

```
$ tree
.
└── dir
    ├── foo
    │   └── baz
    │       └── MainFoo.c
    └── Foo
        ├── baz
        └── MainFoo.c

5 directories, 2 files

```

then

```
find . -depth -iname '*foo*' -execdir rename -- 's/Foo/Bar/;s/foo/bar/' {} +

```

results in

```
$ tree
.
└── dir
    ├── bar
    │   └── baz
    │       └── MainBar.c
    └── Bar
        ├── baz
        └── MainBar.c

5 directories, 2 files

```
As noted earlier, you are asking about perl and showing the code in sh.

If you want use Perl 5

* Module `File::Find::Rule` will help you find will help you find directories.
* Perl `rename` will do the rest of the job.