Linux command to print directory structure in the form of a tree

Question

Is there any linux command that I can call from a Bash script that will print the directory structure in the form of a tree, e.g.,

folder1
   a.txt
   b.txt
         


        

Answer 1

I'm prettifying the output of @Hassou's answer with:

ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//──/g' -e 's/─/├/' -e '$s/├/└/'

This is much like the output of tree now:

.
├─pkcs11
├─pki
├───ca-trust
├─────extracted
├───────java
├───────openssl
├───────pem
├─────source
├───────anchors
├─profile.d
└─ssh

You can also make an alias of it:

alias ltree=$'ls -R | grep ":$" | sed -e \'s/:$//\' -e \'s/[^-][^\/]*\//──/g\' -e \'s/─/├/\' -e \'$s/├/└/\''

BTW, tree is not available in some environment, like MinGW. So the alternate is helpful.