Sure, here is an example of a POSIX shell script and a Bash script that flatten a hierarchy of folders by copying all files to another folder:

POSIX shell script:
```
#!/bin/sh
set -e

# Define the source directory and the destination directory
src_dir="/path/to/source/directory"
dest_dir="/path/to/destination/directory"

# Copy all files in the source directory and its subdirectories to the destination directory
find "$src_dir" -type f -exec cp {} "$dest_dir" \;
```

Bash script:
```
#!/bin/bash
set -e

# Define the source directory and the destination directory
src_dir="/path/to/source/directory"
dest_dir="/path/to/destination/directory"

# Copy all files in the source directory and its subdirectories to the destination directory
shopt -s globstar
cp "$src_dir"/** "$dest_dir"/
```

Both scripts use the `cp` command to copy files from the source directory and its subdirectories to the destination directory. The POSIX script uses the `find` command to recursively find all files in the source directory and its subdirectories, while the Bash script uses the `globstar` option to enable recursive globbing.
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