Shell Scripting Interview Questions and Answers
Most Frequently Asked Shell Scripting Interview Questions
|C Shell||Bourne Shell|
|C shell denoted as CSH||Bourne shell denoted as BASH|
|The c shell family is a typical Programming language||The Bourne shell family has a much richer programming language.|
|C shell programming is easier to learn.||Bourne shell programming is difficult to learn.|
|It was developed by Bill Joy in the late 1970s||It was developed by Brian Fox.|
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- Keeping repetitive tasks to a minimum.
- can be used by system executives for procedure backups.
- adding new functions to the shell.
- system admin can automate daily tasks.
- shell script permits you to make your tool.
- Monitoring the system.
In a data program, metacharacters are particular characters that give information about other characters. In shells, they are called regular expressions. A character, not a letter or a number, is usually considered a metacharacter. Using shell metacharacters, you can group commands, redirect and pipe input/output, put commands in the background, reduce the size of file names, etc.
Shell scripts or programs often contain a shebang at the top. In general, the shebang is used to indicate the operating system uses a particular interpreter to process the rest of the file. Here, the symbol '#' is referred to as hash, and "!" is called bang. This generally aids developers in ignoring repeated work.
The engines generally execute scripts; therefore, shebang determines the location of the engine that will be used to run the script.
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$$ specifies the process ID of the currently running process
$! specifies the process ID of the currently running process. Display process IDs of processes that have recently been back grounded.
|Df command||It shows the amount of disk space used and available on the Linux file system.|
|Du command||It shows the amount of disk space used by the specified files and for each and every subdirectory.|
|Btrfs fi df/device/||That shows disk space usage information for a btrfs based mount point/file system.|
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The core concepts are superblocks, inodes, data, directories, and indirect blocks. The superblock contains information about the entire filesystem. B. Its size (exact information depends on the file system). The inode contains all information about the file except its name.
- Read (r): Read permission allows you to open and read the file's contents.
- Write (w): Write permission will enable you to edit, delete, or rename the file.
- Execute (x): A program cannot be run or executed on Unix systems unless the execute permission is set.
The CLI is preferred by professionals looking for performance and speed. However, the GUI requires navigating through various icons. This makes the GUI slow. But with the CLI, you can use your keyboard to navigate the user interface.
To create multiple files, type all filenames consecutively in one touch command and press Enter. For example, to create "myfile1" and "myfile2" simultaneously, the command would touch myfile1 myfile2.
The Linux/Unix mkdir command allows the user to create or create a new directory. mkdir stands for "make directory." You can also use mkdir to set permissions and simultaneously create multiple directories (folders).
'=' is an assignment operator that assigns values on the right to the variable on the left.
The '==' operator checks if the two specified operands are equal.
You can pass arguments, and this is a common practice. It was sent to prevent system errors when executing commands and to ensure smooth script execution. Within the script, the variable $1 refers to the command line's first argument, and $2 to his second argument.
"The file name: $0."
"The first argument is $1." "The second argument is $2." "The third argument is $3."
Debugging options available in the bash shell can be turned on and off in various ways. For example, inside the script, you can use the set command or add options to the shebang line. However, an alternative is explicitly specifying debug options on the command line while running the script.
All these above Shell scripting interview questions allow you to explain what makes you stand out among all the other candidates and how you will be an asset to that particular company. After going through the above questions and their answers, you have the perfect opportunity to convince the interviewer why you are the right candidate for the job. In addition, you will be able to show the interviewer what you have to offer the company if you are hired and present when the shell script is running and inherits the parent's environment.