Bash FOR loop

For loop is a structure that executes a number of times, generally known in advance. In Bash script syntax of FOR loop is:

for VARIABLE [in LIST]; do COMMANDS BLOCK; done

or

for VARIABLE [in LIST]
do
   COMMANDS_BLOCK
done

LIST is a list of words or numbers. If LIST is omitted $@ is implied.

Simple examples:
1. This example prints all files in directory

dirlist=$(ls)
for i in $dirlist
do
   echo $i
done


2. This example prints numbers from 1 to 10

for i in {1..10}
do
   echo $i
done

or

for i in 1 2 3 4 5 6 7 8 9 10
do
   echo $i
done 

3. This example prints number from 1 to 10 with step 2

for i in {1..10..2}
do 
   echo $i
done

4. This example prints