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...
Question. I am running Linux system (Ubuntu) system. Its root user has 100K emails to their mailbox. How do I remove all emails from root mailbox? How can I remove all emails using shell prompt on Linux system? This tutorial will help you delete all root user emails from the shell in Linux system....
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...
While working with the Linux systems, we used many of commands on daily basis. Most of the commands are available in binary format in /bin, /sbin , /usr/bin, /usr/sbin, etc directories. As a system administrator or student we wrote many of shell script to do few task or automate them. This article will help...
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...
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...
While Loop: while read line do echo $line done < /tmp/file.txt Note: “line” is a variable which contains a single line read from file. Example:- Some times we required to read file content line by line inside shell a script. For this example this script will read /etc/passwd file line by line and print...
Command: read -s -p “Enter Password: ” pswd How to Use:- If you want to take input of password in shell script. You must want to not to show any character on-screen entered by user. Use -s for silent mode. Using -s input characters are not echoed. For example create a shell script named...
# echo -e “e[0;31mText in Red Colore[0m” The Above commands are showing to set foreground ( Text ) color of output on Linux bash shell. The output of above command will be in red color. There are many other colors available which you can use defined as below. Just replace “0;31” with other color...