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tree--ls, grep, and sed
Unix Tree / Linux Tree
Display Structure of Directory Hierarchy
One-Line Shell Script
ls, grep, and sed
Quiz
Quick, what does the following Unix/Linux command do?
| ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/ /' -e 's/-/|/' |
If you said, "Well, that's obvious; it shows a graphical representation of the current sub-directories.", you'd be correct.
Example
You can use the command to create a program called tree that would work something like the following:
dem@ubuntu:~$ tree .local |
Code
Here's the command ready-to-go in a shell script:
| #!/bin/sh ####################################################### # UNIX TREE # # Version: 2.2 # # By Dem Pilafian # # File: ~/apps/tree/tree.sh # # # # Displays Structure of Directory Hierarchy # # ------------------------------------------------- # # This tiny script uses "ls", "grep", and "sed" # # in a single command to show the nesting of # # sub-directories. # # # # Setup: # # % cd ~/apps/tree # # % chmod u+x tree.sh # # % ln -s ~/apps/tree/tree.sh ~/bin/tree # # # # Usage: # # % tree [directory] # # # # Examples: # # % tree # # % tree /etc/opt # # % tree .. # # # # Public Domain Software -- Free to Use as You Like # # http://www.centerkey.com/tree # ####################################################### 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 |
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