Shell Scripting Homework Help:

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   Over view about Shell Scripting Homework Help:
           
           What is shell scripting? To put it in layman terms a computer understands only 0s and 1s. For a normal human being it is very difficult to program or read instructions consisting of only 0s and 1s. To overcome this difficultly there is something called a shell which accepts commands or instructions in English, validates the command and passes it to the kernel for execution.

           A shell essentially is a user program. A shell script is a command line interpreter, it takes input from standard input devices like keyboards or files and executes the commands.

   Advantages of Shell Scripting:

• Less time taken to write a shell script as compared to equivalent code in other programming languages
  
  
• Interactive debugging of a shell script is possible
  
  
• Ease of file or program selection
  
  
• Shell script Loads and executes quickly
  
  
• Since a shell script is executed by a interpreter, it is easier to embed a debugging code into a script to detect and fix bugs

   Dis-advantages of Shell Scripting:

• Shell script has a slow execution speed as it is a interpretive language
  
  
• Another reason for slow execution is the need to launch a new process for almost every command executed
  
  
• If we compare a normal compiled programs execution time to the execution time of a equivalent shell script then the shell script is several magnitudes slower
  
  
• Compatibility issues between different platforms

   Different Shells that are available:

• BASH (Bourne Again Shell)
  
  
• CSH (C Shell)
  
  
• KSH (Korn Shell)
  
  
• TCSH