bash - How to go to each directory and execute a command?

Question

How do I write a bash script that goes through each directory inside a parent_directory and executes a command in each directory.

The directory structure is as follows:

parent_directory (name could be anything - doesnt follow a pattern)

• 001 (directory names follow this pattern)
  • 0001.txt (filenames follow this pattern)
  • 0002.txt
  • 0003.txt
• 002
  • 0001.txt
  • 0002.txt
  • 0003.txt
  • 0004.txt
• 003
  • 0001.txt

the number of directories is unknown.

Answer 1

This answer posted by Todd helped me.

find . -maxdepth 1 -type d ( ! -name . ) -exec bash -c "cd '{}' && pwd" ;

The ( ! -name . ) avoids executing the command in current directory.