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Old 12-29-2012
UNIX Basics
Hello,

1) I am trying to get involved in UNIX for educational purposes so I have installed the latest Ubuntu edition 12.04. Do you know another package that I could use it instead for educational purposes?

2)What is the difference between "~$" and "/$" (it comes with cd / and cd ~) .The latter "/$" should mean the root user?

3) I also get the root user by using "sudo -s" and I get "root@ubuntu: /#" which I think stands for the root user.I have created some new users with command "adduser".The commands "useradd" and "groupadd" which are morejust don't work (why?).Eventhough I have created the new users when Ι am as "root@ubuntu: /#" Ι can't see the new users? Also when I am connected as "y@ubuntu: /$" ( y is my name) and I type users I only get "y y" who are these users and I why I take them double? Why is that?The same happens when I put "y@ubuntu: ~$".What should I do to see the users?

Thanks for your time...!
 
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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)