Birmingham mumbai

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Here, we're creating a list and populating it with names. Each name is one item in 
the list. We're calling this list 
turtles
. We can see the contents of this list with 
echo
 as 
we would with any other variable:
echo $turtles
Next, let's look at how we set up the 
for
 loop:
for t in $turtles
Now, we're telling the interpreter to prepare to do something for every item in the 
list. The 
t
 here is arbitrary, we could've used any letter here or even a longer string. 
We're just setting up a temporary variable we want to use in order to hold the 
current item the script is working on.
do
With 
do
, we're telling the 
for
 loop to prepare itself to start doing something:
    echo $t
Now, we're printing the current value of 
$t
 to 
stdout
:
done
Just as we did with the 
while
 loop, we type 
done
 to let the interpreter know this is the 
end of the 
for
 loop. Effectively, we just created a 
for
 loop to print each item in a list 
independently:
Donatello
Leonardo
Michelangelo
Raphael
We included four turtle names in our list, and we were able to iterate through them 
and print them out, one by one.
As much as I love turtles (especially the teenage mutant ninja variety), that script 
isn't very practical or useful to us for server administration. Next, we're going to 
write a script that can actually be quite useful.

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Chapter 6