Re: Why `echo -n hello | while read v; do echo $v; done' prints nothing?

[Stephane CHAZELAS]

2010-12-2, 19:04(+08), Clark J. Wang:
> Following command also prints nothing, confused :(
>
> for ((i = 0; i < 10; ++i)); do echo -n " $i"; done | while read v; do echo
> $v; done
>

Basically, if you want the equivalent of "cat" (if we let aside
null bytes and performance), you'd need:

while IFS= read -r v; do
  printf '%s\n' "$v"
done
[ -z "$v" ] || printf %s "$v"

-- 
Stephane