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UNIX/LINUX COMMAND

Unix / Linux Command cat  --- for creating and displaying short files chmod  --- change permissions cd  --- change directory cp  --- for copying files date  --- display date echo  --- echo argument ftp  --- connect to a remote machine to download or upload files grep  --- search file head  --- display first part of file ls  --- see what files you have lpr  --- standard print command (see also  print  ) more  --- use to read files mkdir  --- create directory mv  --- for moving and renaming files ncftp  --- especially good for downloading files via anonymous  ftp . print  --- custom print command (see also  lpr  ) pwd  --- find out what directory you are in rm  --- remove a file rmdir  --- remove directory rsh  --- remote shell setenv  --- set an environment variable sort  --- sort file tail  --- display last part of file ta...
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RADIO BUTTON COMPONENT OF AWT IN JAVA

import java.awt.*; import java.awt.event.*; class Radio implements ItemListener {     Frame fr;     Panel p;     CheckboxGroup cgp;     Checkbox c1,c2,c3;     private String msg;         public Radio()     {         fr=new Frame("RADIO BUTTON");         p=new Panel();         cgp=new CheckboxGroup();         c1=new Checkbox("CASH",cgp,true);         c2=new Checkbox("CHEQUE",cgp,false);         c3=new Checkbox("DEMAND DRAFT",cgp,false);         p.add(c1);         p.add(c2);         p.add(c3);         c1.addItemListener(this);         c2.addItemListener(this);         c3.addItemListener(this);         fr.add(p);   ...
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IP ADDRESS CLASSES

IP address classes Class 1 st  Octet Decimal Range 1 st  Octet High Order Bits Network/Host ID (N=Network, H=Host) Default Subnet Mask Number of Networks Hosts per Network (Usable Addresses) A 1 – 126* 0 N.H.H.H 255.0.0.0 126 (2 7  – 2) 16,777,214 (2 24  – 2) B 128 – 191 10 N.N.H.H 255.255.0.0 16,382 (2 14  – 2) 65,534 (2 16  – 2) C 192 – 223 110 N.N.N.H 255.255.255.0 2,097,150 (2 21 – 2) 254 (2 8  – 2) D 224 – 239 1110 Reserved for Multicasting E 240 – 254 1111 Experimental; used for research Note:  Class A addresses 127.0.0.0 to 127.255.255.255 cannot be used and is reserved for loopback and diagnostic functions. Private IP Addresses Class Private Networks Subnet Mask Addr...
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