cardos-tool - Man Page

displays information about Card OS-based security tokens or format them


cardos-tool [Options]


The cardos-tool utility is used to display information about smart cards and similar security tokens based on Siemens Card/OS M4.


--format,  -f

Format the card or token.

--help,  -h

Print help message on screen.

--info,  -i

Display information about the card or token.

--reader arg, -r arg

Number of the reader to use. By default, the first reader with a present card is used. If arg is an ATR, the reader with a matching card will be chosen.

--startkey arg, -s arg

Specify startkey for format.

--change-startkey arg, -S arg

Change Startkey with given APDU command.

--verbose,  -v

Causes cardos-tool to be more verbose. Specify this flag several times to enable debug output in the opensc library.

--wait,  -w

Causes cardos-tool to wait for the token to be inserted into reader.


cardos-tool was written by Andreas Jellinghaus <>.


10/11/2021 OpenSC Tools