ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/ /' -e 's/-/|/'
or
~> tree -d /proc/self/
FYR:https://stackoverflow.com/questions/3455625/linux-command-to-print-directory-structure-in-the-form-of-a-tree
ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/ /' -e 's/-/|/'
or
~> tree -d /proc/self/
FYR:https://stackoverflow.com/questions/3455625/linux-command-to-print-directory-structure-in-the-form-of-a-tree