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Learn how to Program in Python, C, Rust, and more.
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Learn how to create robots in 3D, using Fusion 360 and FreeCAD. The models can be printed out using a 3d printer and then assembled into a physical robot.
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By Kevin McAleer, 2 Minutes
Shell scripts become more powerful when you use programming constructs like conditional statements, loops, and variables. In this lesson, you’ll learn how to use these basic scripting constructs to make your scripts more dynamic and functional.
if
else
for
while
Variables allow you to store and reuse values in your scripts. To define a variable and use it:
#!/bin/bash name="Raspberry Pi" echo "Hello, $name!"
Note that the variable name should not have spaces around the = sign. Also note when the variable is used, it is prefixed with a $; $name in this case.
name
=
$
$name
Conditional statements enable your script to make decisions. Here’s a basic example using if and else:
#!/bin/bash if [ -f "/etc/passwd" ]; then echo "The file exists." else echo "The file does not exist." fi
Loops allow you to repeat tasks multiple times. Here’s an example of a for loop:
#!/bin/bash for i in 1 2 3 4 5 do echo "Iteration $i" done
And a while loop:
#!/bin/bash count=1 while [ $count -le 5 ] do echo "Count is $count" count=$((count + 1)) done
In this lesson, you learned how to use variables, conditional statements, and loops in your shell scripts. These constructs make your scripts more powerful and flexible, allowing you to automate complex tasks more effectively.
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