for d in [0-9][0-9][0-9]
do
    ( cd "$d" && your-command-here )
done

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

find . -type d -execdir realpath "{}" ';'

find . -type d -execdir sh -c 'printf "%s/%sn" "$PWD" "$0"' {} ;

find . -name .git -type d -execdir git pull -v ';'

find . -type d -exec sh -c 'cd -P -- "{}" && pwd -P' ;

find . -type d -print0 | xargs -0 -L1 sh -c 'cd "$0" && pwd && echo Do stuff'

find . -type d -print0 | while IFS= read -r -d '' file; do
# ...
done

dirs=($(find . -type d))
for dir in "${dirs[@]}"; do
  cd "$dir"
  echo $PWD
done

mapfile -t -d '' dirs < <(find . -type d -print0)

ls -d */ | awk '{print $NF}' | xargs -n1 sh -c 'cd $0 && pwd && echo Do stuff'

for dir in `ls $YOUR_TOP_LEVEL_FOLDER`;
do
    for subdir in `ls $YOUR_TOP_LEVEL_FOLDER/$dir`;
    do
      $(PLAY AS MUCH AS YOU WANT);
    done
done

for dir in PARENT/*
do
  test -d "$dir" || continue
  # Do something with $dir...
done

#!/bin/bash

#Use set -x if you want to echo each command while getting executed
#set -x

#Save current directory so we can restore it later
cur=$PWD
#Save command line arguments so functions can access it
args=("$@")

#Put your code in this function
#To access command line arguments use syntax ${args[1]} etc
function dir_command {
    #This example command implements doing git status for folder
    cd $1
    echo "$(tput setaf 2)$1$(tput sgr 0)"
    git tag -a ${args[0]} -m "${args[1]}"
    git push --tags
    cd ..
}

#This loop will go to each immediate child and execute dir_command
find . -maxdepth 1 -type d ( ! -name . ) | while read dir; do
   dir_command "$dir/"
done

#This example loop only loops through give set of folders
declare -a dirs=("dir1" "dir2" "dir3")
for dir in "${dirs[@]}"; do
    dir_command "$dir/"
done

#Restore the folder
cd "$cur"

cd parent
find . -type d | while read d; do
   ls $d/
done

find .

find . | xargs 'command here'

for p in [0-9][0-9][0-9];do
    (
        cd $p
        for f in [0-9][0-9][0-9][0-9]*.txt;do
            ls $f; # Your operands
        done
    )
done

ls -d */ | xargs -I {} bash -c "cd '{}' && pwd"