How to set enviroment variables in windows

Right click on the Computer --> Click Advanced system settings --> Click Environment Variables

Windows commands

• 1. Get the help of a command
  
  • Syntax
  • # command ?/
  • Example:
  • # taskkill ?/
  • Displays the usage of the taskkill command.
• 2. List all the process running on the windows system.
  
  • Syntax
  • # tasklist
  • # tasklist /FI "IMAGENAME eq java.exe" - This command list all the process where the image name is java.exe
• 3. Kill specific process in the command prompt?
  
  • Example:
  • # taskkill /PID process_id
  • # taskkill /PID 8760
  • This command kills the process whose id is 8760.
• 4. Kill all java process running on the system.
  
  • Example:
  • taskkill /F /IM java.exe
  • /F – Delete java.exe process forcefully.
  • /IM – Image name of the process
• 5. List out all TCP/IP connections.
  
  • Syntax
  • # netstat
  • Example:
  • # netstat –aon
  • a – List all TCP/IP connections and listening ports.
  • o – Display process id associated with each connection.
  • n – Display addresses and port numbers in Numerical format.
    
    
• 6. Find out a process running on specific port.
  
  • Syntax
  • # netstat
  • Example:
  • # netstat –aon | findstr 0.0.8080
  • Consider that Tomcat is running on the 8080 port. The output of the above command is
    
    

MD5

What is MD5?

Message Digest Algorithm is a command line utility used to check the data integrity of a file where it is downloaded from network.

How to install MD5?

Step 1: Download md5sum.exe file from this site http://etree.org/cgi-bin/counter.cgi/software/md5sum.exe

Step 2: Set the location of this exe file in the Path variable.

Right Click on Computer ---> Properties ---> Advanced System Settings ---> Environment Variables ---> Edit Path Variable ---> Add the location (Ex. C:\softwares\md5 – Location of the md5sum.exe).

Step 3: Go to the command prompt and type md5sum –version. Now the md5 utility is successfully installed.

What does md5checksum will do?
        This utility will generate 128 bit hash value which will be used to check the file corruption.

How to verify the downloaded file is not corrupted in windows?

Step 1: Download a file with its corresponding checksum file (extension with md5) or checksum value.
         Ex: I downloaded commons-io-2.0.1-bin.zip file from http://commons.apache.org/io/download_io.cgi

Step 2: Note down the MD5 value - 32a46d8f3c22ecf2be8217f19bb81282

Step 3: Go to the command prompt and type the following command
            > md5sum file-name
      Ex: > md5sum commons-io-2.0.1-bin.zip

This command generated some value. Check this value with the MD5 value that noted previously. Both values are same so that the file is downloaded without any corruption.