Most professionals in the software development and IT industry need to learn how to use different tools for them to remain relevant. The professionals use Linux a lot, and knowing how to use some of the Linux tools like Bash is very useful as it helps you have more power over the entire operating system. Many people are wondering what Bash is and how it can help them in their daily activities. Most IT jobs require one to know how to use Bash to create scripts. The scripts enable users to enjoy some of the activities they struggle with. They make debugging easy and support all versions of the Linux operating system. You can run processes using multiple commands; they are portable, save time, e.t.c. Understanding Linux Bash greatly impacts how the team runs all their operations. The article will enable the readers to understand what bash is, how to write different Bash scripts and its installation, e.t.c.
Bash is the acronym of Bourne-Again Shell, which got named after the famous Stephen Bourne, who used it as a bunter. It works as an interpreter for the different operating systems. It is compatible with other scripts like sh and works well with features from ksh and csh shells. Developers use it to look up different commands and search different directories to see if there are directories that match the typed command. Bash executes the commands if there are matching directories or what it was instructed to do. Most of the users enjoy how Bash has improved their productivity and performance.
Bash is a type of shell that is Unix based and was mostly used as the default shell for the Linux distributions like Ubuntu, Kali, Fedora, e.t.c.It works as a command processor that usually works under a text window. It helps users execute and read different commands from different files. Using the globbing technique, you can use it to identify different characters from files. It also uses message passing to improve communication between different computer systems. It has stream literals that support different features of file formatting like line breaks and whitespaces. It uses different keywords, variables, and syntax to get the desired result. It also works well with other extensions to improve its functionalities.
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There are several steps one has to follow when downloading Bash. These steps are:
Open the terminal and type the following command:
sudo apt-get install build-essential
After that process is complete, you can access the GNU servers to get some important packages using the following command:
wget https://ftp.gnu.org/gnu/bash/bash-4.4.tar.gz
After getting the packages, we need to compile the packages and install them by typing the command below:
tar xf bash-4.4.tar.gz
After that, head over to the created directory of bash by typing :
cd bash-4.4
After getting access to the directory, we need to carry out the configuration by typing the following command:
./configure
Complete the steps by typing the commands below:
make
sudo make install
Complete the installation by typing the command below, and you are good to use Bash.
sh
There are several ways of how one can write Bash scripts in Linux. Let us look at how you can write several scripts. When working with scripts, you will notice that it starts with #! Which shows where the scripts start. When you want to add comments to the scripts, you use # to add them.
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If you want to collect some information using a script or make it interactive. You can make the script accept input from different users.
nano studentrecords.sh
#!/bin/bash
read -p "Provide us with your registration Number?: "registration_number
After inputting the name, we will provide the user with different options to choose which course they do the university. We will use an array list and assign each course to an index as shown below:
course[0]="Data science"
course[1]="Computer Science"
course[2]="Human Resource"
course[3]="Business Management"
course[4]="Education"
course[5]=” Engineering”
studentdetails=${#course[@]}
studentissue=$(($RANDOM % $studentdetails))
echo ${course[$studentissue]} $registration_number
bash studentrecords.sh
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It will help us understand how to write basic bash scripts in Linux. This simple script will help us learn how to work with Bash.
nano goodmorning.sh
#!/bin/bash
echo “Good Morning”
When you want to improve automation, you make a bash script that can help you achieve that. In cases where you find yourself typing the same things repeatedly, you can use Bash to eliminate the repetitive processes.
chmod +x records.sh
./records.sh https://google.com
You must add different parameters to the commands when using the terminal to handle different arguments. For example, when y you want to check the status of a URL, we will follow the steps below:
nano checker.sh
Let the interpreter understand by adding the shebang
#!/bin/bash
We now use the echo command to print the status code of the URL, and you will have to add the value that you will use under the argument i.e
echo "The HTTP code for URL " 3 " is..."
echo "${response}"
bash checker.sh https://gumanlen.com
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Linux Bash has different features. Some of the features include:
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Now you have an understanding of Linux Bash and how to use it. To master some of the essentials and use them with more proficiency, you need to do more practice or attend training on Linux. Those who have little or no programming experience can also enjoy using Bash. It is not complicated, as many other people put it. Many IT administrators must be good at using Linux Bash to handle tasks faster.
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Bash automates most development tasks like debugging, testing, change management, code compilation, e.t.c.
No, Linux is not the same as bash.
It is found under the /usr/bin/ directory.
Linux mostly uses shell, but you can use bash in some cases.
Open your machine terminal and type, and then hit Enter. If it is not successful, you will get the message.