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Shell scrpting(payal harne)
- 1. SHELL SCRIPTING Linux shell programming
- 2. TABLE OF CONTENT • Why shell Script ? • What is Linux shell ? • Types • Executing script • Basic Example • Advantage/Disadvantage • Application
- 3. Why Shell Scripts ? Shell script can take input from user, file and output them on screen.
- 4. WHAT IS LINUX SHELL ? • Interface provided for user interaction. • It is a command interpreter which reads from standard input / file and executes them • Shell is an environment in which we can run our commands, programs, and shell scripts
- 6. EXECUTING SCRIPT Executing in bash shell Execute by making executable Change the permission of script using command Type the following to see the output #bash <filename> Another shell (child shell) is created and the script is run and once the script is completed it exits from the child shell The execution takes place in the same shell Type the following to see the output #./<filename>
- 7. BASIC EXAMPLE #!/bin/bash echo "Welcome!! Please Enter Your Name" read name echo "Hello $name”
- 8. ADVANTAGE • Shell script is much quicker than programming in any other languages. • To automate the frequently performed tasks. • Easy to use and understand. Non-geeks can also modify scripts.
- 9. DISADVANTAGE • Slow execution speed. • Prone to costly errors. • Compatibility problems
- 10. APPLICATION • Automating the code compiling process. • Running a program or creating a program environment. • Completing batch. • Manipulating files. • Linking existing programs together. • Executing routine backups. • Monitoring a system.
- 11. THANK YOU
- 12. Let’s QUIZ it !
- 13. 1) WHICH OF THE FOLLOWING IS NOT A SHELL ?* 1. Bourne 2. Bash 3. Ksh 4. bat
- 14. 2) THE FIRST ARGUMENT IS READ BY THE SHELL INTO THE PARAMETER ___ 1. 1$ 2. $3 3. $$ 4. $1
- 15. 3)THE FIRST LINE IN ANY SHELL SCRIPT BEGINS WITH A ___ 1. & 2. ! 3. $ 4. #
- 16. 4)TO RUN THE SCRIPT, WE SHOULD MAKE IT EXECUTABLE FIRST BY USING ___ 1. chmod +x 2. chmod +r 3. chmod +w 4. chmod +rwx
- 17. 5) SHELL SCRIPTS NEED TO BE SAVED WITH AN EXTENSION .SH . 1. True 2. False