pwgen, sshuttle, trap, tree: move to common (#6551)

pages/common/tree.md

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+# 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):
+
+`tree -L {{num}}`
+
+- Print directories only:
+
+`tree -d`
+
+- Print hidden files too with colorization on:
+
+`tree -a -C`
+
+- Print the tree without indentation lines, showing the full path instead (use `-N` to not escape non-printable characters):
+
+`tree -i -f`
+
+- Print the size of each file and the cumulative size of each directory, in human-readable format:
+
+`tree -s -h --du`
+
+- Print files within the tree hierarchy, using a wildcard (glob) pattern, and pruning out directories that don't contain matching files:
+
+`tree -P '{{*.txt}}' --prune`
+
+- Print directories within the tree hierarchy, using the wildcard (glob) pattern, and pruning out directories that aren't ancestors of the wanted one:
+
+`tree -P {{directory_name}} --matchdirs --prune`
+
+- Print the tree ignoring the given directories:
+
+`tree -I '{{directory_name1|directory_name2}}'`