🔄 Shell Loops

Loops let you repeat actions in your script. This guide introduces the basic shell script loops.

The `for` Loop

The for loop repeats commands for each item in a list.

for VARIABLE in ITEM1 ITEM2 ITEM3; do
    ACTIONS
done

for file in "/sdcard/test1.txt" "/sdcard/test2.txt"; do
    if exist "$file"; then
        ui_print "$file exists"
    fi
done

This checks if each file exists and prints a message if it does.

tip

The variable (file) holds the current item each time the loop runs.

The while loop runs as long as a condition is true—like waiting for something.

while CONDITION; do
   ACTIONS
done

count=1
while is_less $count 4; do
    ui_print "Count: $count"
    count=$((count + 1))
done

This Prints Numbers from 1 to 3.

The until loop runs until a condition becomes true—the opposite of while.

until CONDITION; do
   ACTIONS
done

attempts=0
until is_equal $attempts 2; do
    ui_print "Attempt: $attempts"
    attempts=$((attempts + 1))
done

This prints attempts until reaching 2.