of pcsc-lite adds a new configuration possibility:
With systemd it is possible to configure a file that will contain definitions
for the process started by systemd. In our case the started process is the
The file name is defined in
and is, by default, /etc/default/pcscd. You can change the path
--sysconfdir= argument for ./configure.
pcscd environment variables
A first use case is to define environment variables to change the behaviour of
For example you can add in this file:
so that readers with "Twin" in the name will be ignored.
See "Remove and/or customize PC/SC reader names" for more details and use cases.
You can also define other variables like:
pcscd is started with the extra parameter
$PCSCD_ARGS. By default
this variable is empty. But you can define
/etc/default/pcscd to add more arguments to pcscd.
For example you can use:
to get debug messages in the systemd journal.
To see the pcscd logs in live use:
$ journalctl --unit pcscd --follow
/etc/default/pcscd is a user file so you can edit it as you like.
It should not prevent a package upgrade for example.
It is also much simpler and safer than editing systemd files directly.