Replacing space with newline

There are a few ways to achieve that:

1. sed

$ echo "one two three" | sed 's/ /\n/g'
one
two
three

2. awk

$ echo "one two three" | awk '$1=$1' RS= OFS="\n"
one
two
three

3. tr

$ echo "one two three" | tr -s ' ' '\n'
one
two
three

3 ways to do it, have fun