create subdirectory in multiple directories with linux code example

Example 1: linux mkdir multiple levels

# The -p option tells mkdir to create parent directories as needed
mkdir -p bin docs/personal docs/business lib

Example 2: bash how to create directories in all subdirectories

# Example usage:
for dir in */; do mkdir -- "$dir"/{dir1,dir2,dir3}; done
# This creates directories dir1, dir2, and dir3 in all directories 
# found in the current directory.