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for loops in shells

for n in foo bar baz; do echo $n; done

for n in un dos tres; do
  echo $n
done

for n in a b c
do
  echo $n
done

Iterating over $@

Consider the following script. In absence of a in, the for command iterates over $@:
iterate.sh
#!/bin/sh

for i do
  echo $i
done
If this script is called like so: 
./iterate.sh one two three
the output will be: 
one
two
three