Traverse & Enumerate

cd ..	Move Up One Directory Level.
cd ~	Change to Home Directory.
cd -	Change to Previous Directory.
pushd and popd	Manage directory stack for easy backtracking.
pushd -R <dir>	Enter a directory and push it onto the stack, recursively entering subdirectories.
pwd	Print Working Directory.
tree <dir>	Display Directory Structure.
tree <dir> -d	Only directories.
tree <dir> -L <level>	Limit depth.
tree <dir> -F	Append file type indicators to filenames.
realpath <relative_path>	Resolve Relative Paths.
readlink <symbolic_link>	Display the Target of a Symbolic Link.