shell scripting

1. How do you find out what抯 your shell? Operating System/Shell Scripting echo $SHELL

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2. How do you fire a process in the background? Operating System/Shell Scripting ./process-name &

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3. How do you refer to the arguments passed to a shell script? Operating System/Shell Scripting $1, $2 and so on. $0 is your script name.

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4. What抯 the conditional statement in shell scripting? Operating System/Shell Scripting if then ?fi

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5. How do you do number comparison in shell scripts? Operating System/Shell Scripting -eq, -ne, -lt, -le, -gt, -ge

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6. How do you test for file properties in shell scripts? Operating System/Shell Scripting -s filename tells you if the file is not empty, -f file...

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7. How do you do Boolean logic operators in shell scripting? Operating System/Shell Scripting ! tests for logical not, -a tests for logical and, and ...

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8. How do you find out the number of arguments passed to the shell script? Operating System/Shell Scripting $#

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9. What抯 a way to do multilevel if-else抯 in shell scripting? Operating System/Shell Scripting if then elif fi

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10. How do you write a for loop in shell? Operating System/Shell Scripting for in do done 11. How do you write a while loop in shell? Operating System/Shell Scripting while do done 12. How does a case statement look in shell scripts? Operating System/Shell Scripting case in ) ;; ) ;; esac 13. How do you read keyboard input in shell scripts? Operating System/Shell Scripting read 14. How do you define a function in a shell script? Operating System/Shell Scripting function-name() 15. How do you stop all the processes, except the shell window? Operating System/Shell Scripting kill 0 16. How do you find out about all running processes? Operating System/Shell Scripting ps -ag 17. How do you stop a process? Operating System/Shell Scripting kill pid 18. What抯 the command to find out today抯 date? Operating System/Shell Scripting date 19. What抯 the command to find out users on the system? Operating System/Shell Scripting who 20. How do you find out the current directory you抮e in? Operating System/Shell Scripting pwd 21. How do you remove a file? Operating System/Shell Scripting rm 22. How do you remove recursively? Operating System/Shell Scripting rm -rf 23. How do you find out your own username? Operating System/Shell Scripting whoami 24. How do you send a mail message to somebody? Operating System/Shell Scripting mail somebody@interviewduniya.com -s 慪our subject?-c ... 25. How do you count words, lines and characters in a file? Operating System/Shell Scripting wc 26. How do you search for a string inside a given file? Operating System/Shell Scripting grep string filename 27. How do you search for a string inside a directory? Operating System/Shell Scripting grep string * 28. How do you search for a string in a directory with the subdirectories recursed? Operating System/Shell Scripting grep -r string * 29. What are PIDs? Operating System/Shell Scripting They are process IDs given to processes. A PID can vary... 30. How do you list currently running process? Operating System/Shell Scripting ps