Computers and Problem Solving
Computers and Problem Solving ECE 1331
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This 4 page Class Notes was uploaded by Karolann Wiegand on Saturday September 19, 2015. The Class Notes belongs to ECE 1331 at University of Houston taught by Staff in Fall. Since its upload, it has received 8 views. For similar materials see /class/208311/ece-1331-university-of-houston in Electrical Engineering at University of Houston.
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Date Created: 09/19/15
9707 Telnet Telnet is an application which provides terminal emulation connections to remote machines The application consists of two pieces of software that cooperate The client which runs on the machine that is requesting the service and the server which runs on the computer providing the service The network provides the medium by which the two communicate The simplest way to use telnet is from the command line of the client machine type telnet ltaddressgt where ltaddressgt is the domainstyle address of the remote machine Hgt telnet bayouuhedu Assuming the server application is running on the remote machine it will respond with possibly some messages followed by the standard quotloginquot prompt ofthe remote machine Use of University of Houston computing and network facilities requires prior authorization Unauthorized access is prohibited Usage may be subject to security testing and monitoring Abuse is subject to criminal prosecution A complete manual of security policies and procedures is available at httpwwwuhedu in the Administration directory Compaq Tru64 UNIX V51A Rev 1885 creekuhedu login When a telnet connection is made to a remote machine the user is then in quotterminal emulationquot mode and simply logs into the remote machine All text typed at the local machine is given to the remote machine as ifit were typed there In this mode the user is never giving commands to the telnet program itself When the user logs out of the remote machine the connection is closed and telnet terminates creekuhedugt logout Connection to host lost Hgt However there are two ways to give commands to telnet itself First ifyou type telnet without an address you are in the telnet client program with a telnetgt prompt and without a connection to a remote machine net Welcome to Microsoft Telnet Client Escape Character is 39CTRL39 Microsoft Telnetgt Now you can give commands that the telnet client recognizes Microsoft Telnetgt help Commands may be abbreviated Supported commands are close close current connection c d display display operating parameters 0 open hostname port connect to hostname default port 23 q quit exit telnet set set set options type 39set 39 for a list sen send send strings to server 9707 st status print status information u unset unset options type 39unset 39 for a list h help print help information Microsoft Telnetgt close Microsoft Telnetgt status Not Connected Microsoft Telnetgtquit Hgt Second if you are connected to a remote machine entering the escape character ctr written A in telnet documentation will return you temporarily to the telnetgt prompt to enter commands to the telnet client Unless you have quotclosedquot the session on the remote machine you can return to it by simply typing quotenterquot at the telnet prompt after which you are back to the remote host Hgt telnet bayouuhedu Use of University of Houston computing and network facilities requires prior authorization Unauthorized access is prohibited Usage may be subject to security testing and monitoring Abuse is subject to criminal prosecution A complete manual of security policies and procedures is available at httpwwwuhedu in the Administration directory Compaq Tru64 UNIX V51A Rev 1885 bayuhedu login Password La successful login for elee0 Fri Sep 7 133810 CDT 2007 from BarrEEUHEDU Last unsuccessful login for elee0 Thu Sep 6 105737 CDT 2007 from TuxedoEGRUHEDU bayuhedugt ls 2136 bgarciaout ftnccpas lafkoffout sattlerout News bin gitaudat macalosdat seatass acctgen castrejondat gonzalezmdat macalosout testdat acunzodat deadletter gradebk mail torresdat address deleondat jwilldat mathfor torresout adefdat deleonout kimdat mathforttxt vasguezdat admin eegpa exe kimout mccabepas vasguez out alisaradat eegpafor ladnerdat omoniyidat verasteguidat ballweg c erol dat ladner out guote txt bgarciadat favordat lafkoffdat sattlerdat bay uh edugt A typed but not echoed to the screen Welcome to Microsoft Telnet Client Escape Character is 39CTRL39 Microsoft Telnetgt status Connected to bayouuhedu Negotiated term type is ANSI Micros oft Te 1 netgt hit carriage return key bay uh edugt back in the session There is often confusion between the close and quit commands which are commands to the telnet client and the command used to quotlogoutquot on the remote system If you simply type quotclosequot or quotquitquot at the command prompt ofthe remote system and it is not a command recognized by that operating system then nothing will happen bayuhedugt close close Command not found bayuhedugt quit quit Command not found bayuhedugt 9707 Although you can quotescapequot to your telnet client and then give the close command to terminate the connection or the quit command to terminate the telnet client we urge you not to terminate things this way On some systems the server will hang and you will not be able to telnet back to that system easily In fact we once had an IBM mainframe where if something happened to yourtelnet session to it you had to phone the mainframe operator to disconnect you You should always quotlogoutquot at the command prompt of the remote system it is not always the word quotlogoutquot that does this on another of our old mainframes it was quotbyequot telnet to Engineering Unix The quottelnet serverquot alias to which all users should connect when using telnet to the engineering Unix cluster from a remote location is telnetegruhedu When the connection is made you will discover the machine you have actually reached Hgttelnet telnetegruhedu Fedora Core release 4 Stentm Kernel 2617 l21427FC4smp on an i686 login barr Password Last login Thu Sep 6 150756 from BarrEEUHEDU TuxedoEGRUHEDUgt Close Close Command not found TuxedoEGRUHEDUgt quit quit Command not found TuxedoEGRUHEDUgt logout Connection to host lost Hgt It happens that the engineering unix telnetegruhedu is con gured so that when connected in a session typing exit at the command prompt generates a quotlogoutquot command and the session is terminated and telnet is too Hgttelnet telnetegruhedu Fedora Core release 4 Stentm Kernel 2617 l21427FC4smp on an i686 login barr Password Last login Thu Sep 6 150756 from BarrEEUHEDU TuxedoEGRUHEDUgt exit Connection to host lost Hgt However not all remote systems are con gured to translate the quotexitquot command into a logout So we strongly encourage you to always use whatever the remote system requires to log out telnet to CougarNet None available at this time 72001 Microsoft Excel Functions Math amp Trigonometry ABSnumber ACOSnumber ASNnumber ATANnumber ATAN2xnum ynum COSnumber DEGREESangeinradians EXPnumber FACTnumber NTnumber LNnumber LOGnumber base LOG10number MODnumber divisor P PRODUCTnumber1 number2 RADANSangeindegrees DO RAN DBETWEENbottom top ROUNDnumber numdigits SIGNnumber SNnumber SQRTnumber SUMnumber1 number2 SUMFrange criteria sumrange SUMPRODUCTarray1 array2 SUMSQnumber1 number2 TANnumber TRUNCnumber numdigits Logical AN Dogica1 ogica2 Fogicatest valueiftrue valueiffase NOTogica ORIogicaI1 ogica2 Information ISBLAN Kvaue SERRvaue ISERRORvaue SLOGCALvaue SNAvaue SNONTEXTvaue ISN UM BERvaue STEXTvaue Lookup amp Reference CHOOSEindexnum value1 value2 COLUMNreference COLUMNSrange HLOOKU Pookupvaue tabearray rowindexnum rangeookup IN DEXreference rownum conum MATCHookupvalue ookuparray matchtype ROWreference ROWSrange VLOOKU Pookupvaue tabearray columnindexnum rangeookup LOOKU Pookupvaue ookupvector resutvector Statistical AVERAGEnumber1 number2 AVERAGEAnumber1 number2 COUNTvaue1 value2 COUNTAvaue1 value2 COUNTFrange criteria MAXnumber1 number2 MAXAnumber1 number2 MEDIANnumber1 number2 MNnumber1 number2 MINAnumber1 number2 MODEnumber1 number2