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3 days ago · Advanced Shell Scripting Interview Questions. Here are some bash shell scripting interview questions for experienced developers: 37. Name two files of the crontab command. The two crontab command files are as follows: cron. deny: These files determine which user or users should be blocked from using the crontab command.
- Intellipaat
- 1. What is a shell script?A file containing a series of commands that are translated and carried out by a shell interpreter is known as a shell script. It enables task autom...
- 2. How is a shell script written?You must create a plain text file with the extension .sh to construct a shell script. The script can be written using any text editor, such as vi,...
- 3. Which command is used to execute a shell file?To execute a shell script (a text file containing shell commands), you typically use ./script.sh extension. Replace "script.sh" with the actual nam...
- 4. Name the most commonly used shells on a typical Linux system.Linux shells primarily fall into two categories: C-shell and Bourne shell. Their derivatives are as follows: C-shell: TENEX C-Shell, Z-Shell Bourne...
- 5. Explain the difference between single quotes (') and double quotes (Here are the major differences between single quotes (‘) and double quotes (“) in shell scripting: Parameter Single Quotes (‘) Double Quotes (“) Va...
- 6. What is the purpose of the case statement in shell scripting?The purpose of the case statement in shell scripting is to provide a structured and efficient way to perform conditional branching based on pattern...
- 7. Define shell variable.A shell variable forms the core of a shell script or program. The variable enables the shell program to handle and manipulate stored information. I...
- 8. What is the difference between $$ and $!?$$ and $! are both special variables in Unix-like operating systems$$ and $! $$: It represents the process ID (PID) of the currently executing shel...
- 9. What is a kernel?The kernel is a fundamental computer program within an operating system, responsible for overseeing and coordinating the operations of the computer...
- 10. How do you give a variable in a shell script a value?The variable_name=value format is used to assign values to variables in shell scripts. As an illustration, name="John" gives the variable "name" th...
5 days ago · To check whether a file exists or is readable, use the syntax if [ -f "msg.txt" ] || [ -r "msg.txt" ]; where the OR ( ||) operator combines the two conditions and returns a true expression if either of the conditions is met. Let’s see an example: #!/bin/bash. #Checking if a file exists or if it's readable.
- What happens if both conditions are false when using '||'?When using the OR (||) operator within an ‘if’ conditional in Bash, if both conditions are false, the entire expression becomes False.
- Can 'NOT' ('!') operator be used multiple times consecutively within a single conditional expression...Yes, the 'NOT' ('!') operator can be used multiple times consecutively within a single conditional expression in Bash.
- What happens if I use 'AND' ('&&') and 'OR' ('||') together in a Bash if statement?When you use 'AND' ('&&') and 'OR' ('||') together in a Bash if statement, it’s easy to get confused about the order of precedence. You can use par...
- Can 'OR' ('||') and 'AND' ('&&') operators be nested within each other in Bash if statements?Yes, 'OR' ('||') and 'AND' ('&&') operators can be nested within each other in Bash if statements.
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4 days ago · This tutorial aims to provide beginners with a introduction to shell scripting in Linux, covering basic scripting concepts and practical examples. What is Shell Scripting? In Linux, the shell is a command-line interpreter that allows users to interact with the operating system by typing commands.
5 days ago · 1. Hello World. Hello World is the most simple bash script to start with. We will create a new variable called learningbash and print out the words Hello World. First, open a new shell script file with a text editor of your choice: nano hello.sh. Paste the following lines into it: Plain text. Copy to clipboard.
- Technischer Inhaltsverfasser
5 days ago · Deleting files in Bash Script. Deleting files after user confirmation. Deleting a directory using Bash Script. Mailing in Bash Script. The Sleep command. Check if you are a root user. Appending content to a file. The ‘Wait’ command. Create a function in Bash Script.
5 days ago · Following are the basic structures of these loops with if statements in Bash: “for” Loop with If Statement. for variable in [sequence]; do. #Code to execute for each iteration. if [ condition ]; then. #Code to execute if the condition is true. fi. done. “while” Loop with If Statement.
5 days ago · Here’s an example: #!/bin/bash. #Declaring a boolean variable as true. boolean_variable=true. #Checking if the boolean variable is true. if [ "$boolean_variable" = true ]; then. echo "The Boolean is true"
