Bash Scripting Interview Question and Answers

 Getting Familiar with Bash:

Q: What is the role of Bash in a Linux environment? 

A: Bash is a command interpreter, or shell. It provides a command line user interface for controlling your computer (or Unix computer). It is also a powerful scripting language, as it can combine multiple commands into one script, making it useful for automating tasks.

Q: How do you redirect STDOUT and STDERR in Bash? 

A: You can redirect STDOUT using the “>” operator and STDERR using the “2>” operator. For example, command > file.txt redirects STDOUT to file.txt and command 2> error.txt redirects STDERR to error.txt.

Learning Linux Essentials for Shell Scripting:

Q: How do you use the grep command with regular expressions? 

A: The grep command can be used with regular expressions to search for patterns within files. For example, grep “^test” file.txt will find lines in file.txt that start with “test”.

Q: What is the purpose of sed and awk commands? 

A: sed is a stream editor for filtering and transforming text. 

awk is a programming language used for text processing. Both are powerful tools for manipulating text in shell scripts.

Working with Variables and Arguments:

Q: How do you define and use variables in Bash? 

A: Variables in Bash can be defined using the “=” operator with no spaces around it. For example, VAR=”Hello World” defines a variable VAR with the value “Hello World”. You can use the variable with the “$” symbol, like echo $VAR.

Transforming Input:

Q: How do you use the tr command? 

A: The tr command is used for translating or deleting characters. For example, echo “HELLO” | tr ‘A-Z’ ‘a-z’ will output “hello”.

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