How do I use conditions in shell scripts?

How do I use conditions in shell scripts?

You can use conditional statements like if, else, and case in shell scripts to control the flow of execution.

Can you give me an example of an if statement?

Sure! Here's a simple example:

if [ -f "file.txt" ]; then
    echo "File exists."
else
    echo "File does not exist."
fi

What about using case statements?

A case statement is useful for matching a variable against multiple patterns. Here's an example:

case "$variable" in
    pattern1)
        echo "Matched pattern 1"
        ;;
    pattern2)
        echo "Matched pattern 2"
        ;;
    *)
        echo "No match"
        ;;
esac

Are there any best practices for using conditions?

Yes! Always quote your variables to prevent word splitting and globbing, and use [[ for more advanced conditions.