tree without install

tree.sh

shopt -s globstar
for file in **/*
do
    slash=${file//[^\/]}
    case "${#slash}" in
        0) echo "├── ${file}";;
        1) echo "│   ├──  ${file}";;
        2) echo "│   │   ├──  ${file}";;
    esac
done

# Usefull with an alias into .bashrc : 'alias tree='sh ~/tree.sh'
# Modified (chars for lines) from https://stackoverflow.com/questions/5732696/centos-directory-structure-as-tree