In linux command line to view all the subdirectories in a tree like structure. Here is a shell script which you can use:-

#!/bin/sh
#######################################################
#  UNIX TREE                                          #
#  File: ~/bin/tree.sh                                #
#  created on : Mon Nov 28 08:19:08 IST 2011          #
#  Displays Structure of Directory Hierarchy          #
#  -------------------------------------------------  #
#  This tiny script uses "ls", "grep", and "sed"      #
#  in a single command to show the nesting of         #
#  sub-directories.  The setup command for PATH       #
#  works with the Bash shell (Ubuntu OS X default).   #
#                                                     #
#  Setup:                                             #
#     $ cd ~/bin                                      #
#     $ chmod u+x tree.sh                             #
#     $ echo "PATH=~/bin:\${PATH}" >> ~/.profile      #
#                                                     #
#  Usage:                                             #
#     $ tree.sh [directory]                           #
#                                                     #
#  Examples:                                          #
#     $ tree.sh                                       #
#     $ tree.sh /etc/opt                              #
#     $ tree.sh ..                                    #
#                                                     #
#  Public Domain Software -- Free to Use as You Like  #
#  http://www.nandal.in  -  By Sandeep nandal         #
#######################################################

echo
if [ "$1" != "" ]  #if parameter exists, use as base folder
   then cd "$1"
   fi
pwd
ls -R | grep ":$" |   \
   sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/   /' -e 's/-/|/'
# 1st sed: remove colons
# 2nd sed: replace higher level folder names with dashes
# 3rd sed: indent graph three spaces
# 4th sed: replace first dash with a vertical bar
if [ `ls -F -1 | grep "/" | wc -l` = 0 ]   # check if no folders
   then echo "   -> no sub-directories"
   fi
echo
exit

1. Create a bin directory in your home directory

mkdir ~/bin
cd ~/bin

2. Create a file with the name tree.sh in bin directory of your home directory

gedit ~/bin/tree.sh

3. Copy the above script in your tree.sh file and save it in bin directory under your home directory.

4. Change the permissions of tree.sh file to make it an executable file by

chmod 755 tree.sh

5. Now your tree.sh script is ready to be used. In terminal window use tree.sh command with directory name as argument to see it works.

tree.sh directoryName

or if you dont supply the argument it will list the sub directories of the current directory in a tree like structure.

tree.sh

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