Package: tree
Version: 1.6.0-1
Apparently, tree(1) is currently lacking support for the “--”
POSIX option terminator:
$ tree -- /usr
tree: Invalid argument -`-'.
usage: tree [-acdfghilnpqrstuvxACDFQNSUX] [-H baseHREF] [-T title ] [-L level
[-R]]
[-P pattern] [-I pattern] [-o filename] [--version] [--help] [--inodes]
[--device] [--noreport] [--nolinks] [--dirsfirst] [--charset charset]
[--filelimit[=]#] [--si] [--timefmt[=]<f>] [<directory list>]
$
Also, the --help output is being sent to stderr (thus requiring
$ tree --help 2>&1 | less instead of the conventional
$ tree --help | less), and the -S option description is
misleading:
$ tree --help 2>&1 > /dev/null
…
------- Graphics options ------
-i Don't print indentation lines.
-A Print ANSI lines graphic indentation lines.
-S Print with ASCII graphics indentation lines.
-n Turn colorization off always (-C overrides).
-C Turn colorization on always.
…
$
Namely, contrary to the description, non-ASCII codes (i. e.,
non-7 bit) are used for the (pseudo)graphic decorations:
$ tree -S -d /usr | head | cat --show-nonprinting
/usr
M-CM-DM-D bin
M-3 M-@M-DM-D X11 -> .
M-CM-DM-D games
M-CM-DM-D include
M-3 M-CM-DM-D CL
M-3 M-CM-DM-D GL
M-3 M-3 M-@M-DM-D internal
M-3 M-CM-DM-D X11
M-3 M-3 M-CM-DM-D Xtrans
$
As a work-around, ASCII output may be forced by disabling
localization, like:
$ LC_ALL=C tree -d /usr | head | cat --show-nonprinting
/usr
|-- bin
| `-- X11 -> .
|-- games
|-- include
| |-- CL
| |-- GL
| | `-- internal
| |-- X11
| | |-- Xtrans
$
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