On 04/10/09 14:03, Patrick O'Callaghan wrote:
On Sun, 2009-10-04 at 13:54 +0100, psmith wrote:
On 04/10/09 11:17, Sharpe, Sam J wrote:
2009/10/4 psmith<psmith@xxxxxxxxxxxxxxxxx>:
hi list, whilst trying to run this bash command
for w in {A..Z}{A..Z}{A..Z}{A..Z}{A..Z}{A..Z}{A..Z}{A..Z} ;do echo $w;done>
wl1
Consider that for a second...
You are trying to generate a list of all possible combinations of an 8
character word composed of only uppercase letters - that's 26^8
combinations (208 Billion). Each word is 8 bytes long, which I make to
be 1670616516608 bytes... or to put it another way, 1.5 TB
So, you've got 4 GB of virtual memory and you are trying to fit an
1555GB array into it. Simple mathematics says no. Dumping the
arguments before it dies is pointless, because it hasn't even got as
far as expanding arguments yet.
You need to think of another was to do this and I humbly suggest that
Bash should not be high on your list.
thanks for the reality check sam :o
do you have any suggestions what/where i should be looking to get my
required output?
As Sam says, your initial attempt is trying to produce all 1.5TB at
once, which is why it blows up, but that's going to happen anyway even
if you program the same thing in C. IOW it's not an issue with the Shell
per se, but with the approach to the problem.
Assuming you actually want all 1.5TB of data (really?) you'd be better
consuming it as it's produced, perhaps via a pipe. Of course that
depends on what you're doing with it, which you haven't said.
poc
i'm doing some pen testing of my brother's companies network he wants me
to see if it's possible to get in so I'd be using the output as a word
list, and yes unfortunately i'll need all of it for comparison i'm not
sure if the program (aircrack) takes data from a pipe as a word list,
but i'll look into it
phil
phil
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