A shell is an important layer of Linux architecture. Shell is an interface which takes input from Users and sends instructions to the Kernel, Also takes the output from Kernel and send the result back to output shell. In this tutorial, we use Bash shell for the examples. Basically a shell is of two...
An array is a data structure consist multiple elements based on key pair basis. Each array element is accessible via a key index number. This tutorial will help you to create an Array in bash script. Also, initialize an array, add an element, update element and delete an element in the bash script. Define...
In our previous docker tutorials your learned about how to Install Docker on CentOS or Install Docker on Debian based system. Also, write tutorials about how to create or delete docker containers. This tutorial will help you to get shell access to your running docker container. #1. Using Docker Attach You can get bash...
Bash scripts are very useful for doing work easier. It also helps for task automation. This tutorial will help you to how to include bash script in other bash script. Create Sample Scripts For example, I am creating two scripts, first is config.sh which contains some variables. Second script is our main script main.sh,...
Some times you may require to extract filename and extension in different variables to accomplished a task in bash shell programming. This article will help you to extract filename and file extension from a full file name or path. Let’s follow the below steps: 1. Get filename without Path First remove the full file...
Question – How to add [Y/n] confirmation in our own shell scripts? How to take input from the user as Yes/No/Y/N in bash? Many times you have seen commands ask for confirmation [Y/n] or [Yes/No] input. This is a very useful part to know if a user wants to proceed with the remaining steps...
This is good to test a file has enough permission to do read, write or execute operations. For a good programmer, you should use these functions before doing any operations on the file. 1. Test read permission: Below script will check if the given file has read permission for currently logged in user. This...
While working with bash shell programming, when you need to read some file content. It is good to test that the given file exits or is not empty. This will safe your script from throwing errors. This article will help you to test if the file exists or not and the file is empty...
A Command-line Arguments are passed after the name of a program in command-line operating systems like DOS or Linux and are passed into the program from the operating system. Shell scripts also accept command line arguments similar to nix commands. Command line arguments are useful for passing input to script at runtime which has...
Similar to for loop, while loop is also entry restricted loop. It means condition is checked before executing while loop. Mostly it also can do all the works which for loop can do but in uses it has own benefit of use in programming. Syntax: while [ condition ] do // programme to execute...