tree: add -C, --du and --prune examples (#4332)

pages/linux/tree.md

@@ -1,6 +1,7 @@
 # tree
 
 > Show the contents of the current directory as a tree.
+> More information: <http://mama.indstate.edu/users/ice/tree/>.
 
 - Print files and directories up to 'num' levels of depth (where 1 means the current directory):
 
@@ -10,25 +11,25 @@
 
 `tree -d`
 
-- Print hidden files too:
+- Print hidden files too with colorization on:
 
-`tree -a`
+`tree -a -C`
 
 - Print the tree without indentation lines, showing the full path instead (use `-N` to not escape whitespace and special characters):
 
 `tree -i -f`
 
-- Print the size of each node next to it, in human-readable format:
+- Print the size of each file and the cumulative size of each directory, in human-readable format:
 
-`tree -s -h`
+`tree -s -h --du`
 
-- Filter the tree using a wildcard (glob) pattern:
+- Print files within the tree hierarchy, using a wildcard (glob) pattern, and pruning out directories that don't contain matching files:
 
-`tree -P {{*.txt}}`
+`tree -P '{{*.txt}}' --prune`
 
-- Ignore entries that match a wildcard (glob) pattern:
+- Print directories within the tree hierarchy, using the wildcard (glob) pattern, and pruning out directories that aren't ancestors of the wanted one:
 
-`tree -I {{*.txt}}`
+`tree -P {{directory_name}} --matchdirs --prune`
 
 - Print the tree ignoring the given directories: