Utilities for Developers
Shell script is a scripting language that allows users to automate routine tasks and simplify interaction with the operating system. This language is widely used on Unix and Linux systems, but it can also be used on other operating systems.
Among the strengths of the shell script, its ease of use, flexibility and power stand out. It can be used to perform simple tasks, such as automating file creation, or more complex tasks, such as managing web servers and databases. Furthermore, the shell scripting language is highly customizable, allowing users to create solutions specific to their needs.
However, there are also some negatives to consider. Shell scripting can be less efficient than other programming languages like C or Python, especially for complex tasks. Also, shell scripting can be limited in its ability to handle more advanced programming tasks, such as object-oriented programming.
In short, shell script is a powerful and flexible scripting language that can help automate routine tasks and simplify interaction with the operating system. Although it has some limitations, shell scripting is a valuable tool for any operating system user who wants to make their computer interaction more efficient and personalized.
Arithmetic operators allow you to perform mathematical operations in Shell Script. Here are some of the most common arithmetic operators in Shell Script:
“+” (addition)
“-” (subtraction)
“*” (multiplication)
“/” (division)
“%” (modulo, which returns the remainder of a division)
Here is an example of how to use arithmetic operators in Shell Script to calculate the sum of two numbers:
number 1=5
number 2=10
sum=$((number1 + number2))
echo “The sum of $number1 and $number2 is $sum”
Variables are used in Shell Script to store temporary or permanent data such as strings or numbers. They can be defined and used in a variety of ways in a shell script.
To define a variable in a shell script, simply assign a value to it. Here’s an example of how to define a variable called “name”:
name=”Yan”
To use the variable in a later command in the script, simply use the variable name with a dollar sign ($) before it. Here is an example of how to print the value of the variable “name” using the “echo” command:
echo “Hello, $name!”
We can find internal and external commands.
Comandos internos fazem parte do próprio shell.
Comandos externos são binários armazenados nos diretórios /sbin, /usr/sbin, /usr/bin, /bin ou /usr/local/bin.
Text typed into the terminal can be divided into three parts, the command, options starting with – or —, and the argument. These divisions must be separated by spaces.
As an example, let’s list the files inside the tmp folder, using a long listing.
ls -l /tmp/