12-30-2012
1) fine
2) ~: home directory; /: root directory (file system root, not user "root"). $ is the prompt for non-root users ususally used, can be modified.
3) I don't understand. Adding users creates accounts so they can log in. The users command lists users actually logged in (as does who). So y y indicates you are logged in twice, and nobody else.
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LEARN ABOUT CENTOS
isdnbill
isdnbill(1) Linux System Commands isdnbill(1)
NAME
isdnbill - report isdn costs
DESCRIPTION
isdnbill is a simple and imperfect utility to show the bill for ISDN calls. Note that it is only for indicative purposes! It works best in
Germany, and even then there are no guarantees. Consider its use for educational purposes only...
For better results, use isdnrep.
OPTIONS
-V show version
-a show all connections
-e show incomplete calls
-f recalculate costs _always_
-i show incoming calls
-m prices without VAT
-n do _not_ replace numbers with aliases
-o show outgoing calls
-t show only current connections
-vn verbose level n
-Nnnn show only calls with the specified number
-I show only calls on the internal S0 bus
-E show only calls on the external S0 bus
FILES
/var/log/isdn.log or /var/lib/isdn/calls
isdnlog log file with information about all calls.
/etc/isdn/isdn.conf
general configuration
/etc/isdn/callerid.conf
aliases for telephone numbers
SEE ALSO
isdnlog(5) isdnlog(8) isdnrep(1)
AUTHOR
This manual page was written by Paul Slootman <paul@debian.org>, for Debian GNU/Linux.
ISDN 4 Linux 3.13 2003-10-14 isdnbill(1)