Linux is the open-source operating system that is known for its great security and command-line interface. Shell interview questions & answers are important to know as Shell is a scripting language used to work on the Linux operating system. In this article, we will discuss some of the great shell for Linux interview questions and answers that will help beginners, intermediates, and advanced shell users to land a perfect job. Shell is used in DevOps very often and is required to learn DevOps online. StarAgile provides DevOps online training that covers these topics in detail.
It is a command line interpreter and it translates every command entered by the user into the language understood by the Kernel. It is used to call a program or a function by the user in Linux by entering the command at the command-line interface.
GUI scripting is the Graphical User Interface scripting required to control the computer and applications. It is used for controlling different applications and is used on different operating systems.
There are 2 types of variables used in shell scripting they are as follows,
a. System generated variables – As the name suggests these are the variables generated by the operating system. These variables are viewed by invoking the Set command.
b. User-defined variables – These are the variables that are created by the users, this can be viewed by invoking the echo command.
The shell scripts are the command line text file which consists of commands in the order of execution. The typical executions are printing the file, invoking the program and file saving, modifying and writing, etc.
The 2 advantages of shell scripts are as follows,
a. It enables us to develop our custom operating systems with custom features in it to suit our needs.
b. It helps in developing software applications as per our needs and concerning specific platforms.
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There 2 types are shells in Linux operating system those are C shell and Bourne shell.
The variants of these shells are as follows,
The test command is used to compare the text strings in shell scripts. The test command compares the text strings by comparing each character of the strings.
The C shell is more preferred in the following cases than the Bourne shell,
Any file created in Linux or UNIX has default permissions and to view the file permissions the unmask or user mask command is used for the newly created file. It is the 4 digit octal number used to set and expressed in symbolic values. The default permission of the newly created files is rw-rw-r that is 664.
The permissions are tabulated below,
|3||1+2||execute + write|
|5||1+4||execute + read|
|6||2+4||write + read|
|7||1+2+4||execute + write + read|
It is used to represent the CRON Table. As it uses the CRON schedule to execute the tasks. It is the list of the command used for executing the regular scheduler tasks. The scheduler is called CRONTAB.
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The 2 types of using the Crontab are as follows,
a. Cron.allow – This is used when you want to set permission to allow for the user to use the Crontab command
b. Cron.deny – This is used when you want to set permissions to deny the user to use the Crontab command
There are 3 different methods to check the disk usage using the shell script commands they are as follows,
a. dfspace command: - This is used in checking the free disk usage in terms of megabytes.
b. df command: - This is used to check the free disk space
c. du command: - This is used to check the directory wise disk usage
The different communication commands used in the shell are as follows,
The Crontab files have 6 fields, they are as follows,
The first 5 fields consist of fields on when to execute the commands and the 6th field is the command itself.
e. day of the week(0-6, Sunday = 0)
f. "specify the required command here"
We have discussed the top 15 shell interview questions and answers than may be asked in the DevOps interview on the shell. For the requirement of brevity, we have listed only some questions and answers which are important. However, more questions and answers will be discussed when you take up the DevOps certification course at StarAgile institute. StarAgile is an industry-recognized institute for the DevOps training online which can be taken at the comforts of home and office. We recommend you to enquire about the DevOps training at StarAgile institute and register for the various certification benefits.
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