While Loops: Repeat Until False

While loops repeat while condition is true. Keep going until it's false.

Here's the thing: While loops repeat until condition is false. Use them for unknown iterations.

Basic Syntax

while [ condition ]; do
    # commands
done

My take: While loops repeat while true. Simple.

Common Patterns

Count Down

count=10
while [ $count -gt 0 ]; do
    echo "$count"
    count=$((count - 1))
done

Read Until Empty

while read line; do
    echo "$line"
done < file.txt

Infinite Loop

while true; do
    # commands
    sleep 1
done

My take: Infinite loops need break. Or they run forever.

Common Mistakes (I've Made These)

1. Infinite loops: Make sure condition changes. Or use break.

2. Wrong condition: Check condition. Make sure it can become false.

3. Not updating: Update variables in loop. Or it never ends.

What's Next?

Now that you understand while loops, let's talk about Until Loops.

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Personal note: While loops seemed simple. Then I created infinite loops. Now I'm careful. Check your conditions. Always.