Loops in shell scripts

1. For Loops

• Iterate over a finite list of items (files, names, servers).

Syntax:

for VAR in list; do
  commands
done

2. While Loops

• Repeat commands while a condition is true.

Syntax:

while [ condition ]; do
  commands
done

Notes:

• for is best for known lists.
• while is best for unknown/conditional repetitions.
• Use $(( )) for arithmetic operations.