Re: bash oom problem

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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>
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?


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