"tree" command output with "pure" (7-bit) ASCII output

I'm not sure about this but I think all you need is

tree | sed 's/├/\+/g; s/─/-/g; s/└/\\/g'

For example:

$ tree
.
├── file0
└── foo
    ├── bar
    │   └── file2
    └── file1

2 directories, 3 files
$ tree | sed 's/├/\+/g; s/─/-/g; s/└/\\/g'
.
+-- file0
\-- foo
    +-- bar
    │   \-- file2
    \-- file1

2 directories, 3 files

Alternatively, you can use the --charset option:

$ tree --charset=ascii
.
|-- file0
`-- foo
    |-- bar
    |   `-- file2
    `-- file1

2 directories, 3 files

What about tree --charset unicode ?

|-- boot_print
|   |-- config-2.6.32-5-amd64
|   |-- grub
|   |   |-- 915resolution.mod
|   |   |-- acpi.mod
|   |   |-- affs.mod
|   |   |-- afs_be.mod
|   |   |-- afs.mod
|   |   |-- aout.mod
|   |   |-- ata.mod
|   |   |-- ata_pthru.mod
|   |   |-- at_keyboard.mod
|   |   |-- befs_be.mod
|   |   |-- befs.mod
|   |   |-- biosdisk.mod
|   |   |-- bitmap.mod
|   |   |-- bitmap_scale.mod
|   |   |-- blocklist.mod
|   |   |-- boot.img

I tried the following to change locale. It also outputs ascii code draw lines same as --charset=ascii.

> LANG=C tree