Editing For loop (section)

===1989: Bash===
{{Further|Bash (Unix shell)}}
<syntaxhighlight lang="bash">
# first form
for i in 1 2 3 4 5
do
    # must have at least one command in a loop
    echo $i  # just print the value of i
done
</syntaxhighlight>

<syntaxhighlight lang="bash">
# second form
for (( i = 1; i <= 5; i++ ))
do
    # must have at least one command in a loop
    echo $i  # just print the value of i
done
</syntaxhighlight>

An empty loop (i.e., one with no commands between {{code|do}} and {{code|done}}) is a syntax error. If the above loops contained only comments, execution would result in the message "syntax error near unexpected token 'done'".