Je confirme. La Nspire a bien un shell :

REL:A:\documents\>dir

Contents of A:\documents\
1980-01-01 00:00:00     <Dir> .

Files:                      0
Dirs:                       1
Bytes Per Block:          512
Total Blocks:           57088
Free Blocks:            50009

REL:A:\documents\>cd ..

REL:A:\>ir

Command 'ir' not found!
REL:A:\>dir

Contents of A:\
1980-01-01 00:00:00     <Dir> dev
1980-01-01 00:00:00     <Dir> tmp
1980-01-01 00:00:00     <Dir> phoenix
1980-01-01 00:00:00     <Dir> documents
1980-01-01 00:00:00     <Dir> testingsandbox
1980-01-01 00:00:00     <Dir> logs
1980-01-01 00:00:00     <Dir> widgets

Files:                      0
Dirs:                       7
Bytes Per Block:          512
Total Blocks:           57088
Free Blocks:            50009

REL:A:\>cd logs

REL:A:\logs\>dir

Contents of A:\logs\
1980-01-01 00:00:00     <Dir> .

Files:                      0
Dirs:                       1
Bytes Per Block:          512
Total Blocks:           57088
Free Blocks:            50009

REL:A:\logs\>?

?                    - Display help
APPEND               - Appends data from the console to a file
CD                   - Change the current directory
Check                - Check a Reliance disk
COMPARE              - Compare the contents of two files
CompTest             - Run the Reliance for Nucleus compatibility test
COPY                 - Copy a file
CREATE               - Create a file
DCLTEST              - Execute the DCL unit tests
DEL                  - Delete a file
DIR                  - Display a directory listing
EXIT                 - Exit the shell
FlashFXCheck         - Check the spare unit on disk
FlashFXDiskInfo      - Display FlashFX information
FlashFXDump          - Dump a FlashFX disk image
FlashFXImage         - Read or write a FlashFX disk
FlashFXRemount       - Remount a disk
FlashFXStressMT      - Execute the Multi-threaded VBF unit test
FlashFXTestFMSL      - Execute the FMSL unit test
FlashFXTestVBF       - Execute the VBF unit test
Format               - Format a disk
FSIOTEST             - Execute the File System I/O tests
GetTrans             - Display the transaction mode
HELP                 - Display help
MD                   - Make a directory
RD                   - Remove a directory
REN                  - Rename a file
SetTrans             - Set the transaction mode
Show                 - Display information of a Reliance disk
Test                 - Run the Reliance test suite
TIME                 - Display the current time
TYPE                 - Display the contents of a file on the console
WRITE                - Write to a file using console input
REL:A:\logs\>

Depuis le temps que je le cherchais celui là ^^