$ while true; do date -u; opensc-tool -l; sleep 1; done
Sun Apr 13 11:13:41 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    Yes             Alcor Micro AU9540 00 00
Sun Apr 13 11:13:42 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    No              Alcor Micro AU9540 00 00
Sun Apr 13 11:13:43 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    Yes             Alcor Micro AU9540 00 00
Sun Apr 13 11:13:45 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    No              Alcor Micro AU9540 00 00
Sun Apr 13 11:13:46 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    Yes             Alcor Micro AU9540 00 00
Sun Apr 13 11:13:47 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    No              Alcor Micro AU9540 00 00
Sun Apr 13 11:13:48 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    Yes             Alcor Micro AU9540 00 00
Sun Apr 13 11:13:49 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    No              Alcor Micro AU9540 00 00
Sun Apr 13 11:13:50 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    Yes             Alcor Micro AU9540 00 00
Sun Apr 13 11:13:52 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    No              Alcor Micro AU9540 00 00
Sun Apr 13 11:13:53 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    Yes             Alcor Micro AU9540 00 00
Sun Apr 13 11:13:54 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    No              Alcor Micro AU9540 00 00
Sun Apr 13 11:13:55 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    Yes             Alcor Micro AU9540 00 00
Sun Apr 13 11:13:56 UTC 2014
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    No              Alcor Micro AU9540 00 00