Le 15/07/2021 à 21:23, Greg Wooledge écrivait :
On Thu, Jul 15, 2021 at 05:28:04PM +0200, Léa Gris wrote:
Le 15/07/2021 à 16:36, Gabríel Arthúr Pétursson écrivait :
Hi all,
Executing the following results in a fierce crash:
$ bash -c '{0..255}.{0..255}.{0..255}.{0..255}'
Brace expression expands all the value in memory.
Here you are actually telling Bash to expand 256⁴ or 4294967296 42 Billion
entries.
4.2 billion, but who's counting? :-)
Ah yes, my billions or off by ten folds.
Here is a single-loop version to absolve me of my arithmetical
overstatement:
a=0
while [ $a -lt 4294967296 ]; do
printf '%d.%d.%d.%d\n' \
$((a >> 24)) $((a >> 16 & 255)) $((a >> 8 & 255)) $((a & 255))
a=$((a + 1))
done
--
Léa Gris
