4 special words in the syntax of a For Loop in Unix languages code example

Example 1: for loop in shell script

for i in {1..5}
do
   echo "Welcome $i times"
done

Example 2: bash for loop

#!/bin/bash
for (( c=1; c<=5; c++ ))
do  
   echo "Welcome $c times"
done

Example 3: bash for loop

for FILE in $(ls -A); do la $FILE; done