Need simple example of loop in unix shell script

Which shell? What kind of loop?

Here are some examples:

#!/bin/sh
for i in 1 2 3 4 5
do
  echo "Looping ... number $i"
done

#!/bin/sh
for i in hello 1 * 2 goodbye
do
  echo "Looping ... i is set to $i"
done

#!/bin/sh
INPUT_STRING=hello
while [ "$INPUT_STRING" != "bye" ]
do
  echo "Please type something in (bye to quit)"
  read INPUT_STRING
  echo "You typed: $INPUT_STRING"
done

While loop....

i=1
while [ "$i" -lt "100" ]; do
      echo $i
      let "i=i+1"
      sleep 1
done

Loop to read a file

while read line
do
   echo "$line"
done <filename

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