<pre>
user@pc:~$ for number in 1 2 3
> do
> echo my number is $number
> done
my number is 1
my number is 2
my number is 3

user@pc:~$ for number in 1 2 3 ; do echo my number is $number; done
my number is 1
my number is 2
my number is 3

user@pc:~$ cat x.txt|while read line;do echo $line;done
one-long-line-with-no-spaces
one ling line with spaces

user@pc:~$ for line in `cat x.txt`;do echo $line;done
one<-long-line-with-no-spaces
one
ling
line
with
spaces
</pre>