Hello, I know nothing about writing scripts in linux so maybe you could help me.

How would i go about writing permutations of letters [a-z] and numbers [0-9] of size 8 and store it in the text file? Furthermore the combination must not contain more than two of the same character in a row. So, aabb1125, or 12345678 is fine, while 23zzzart would not be valid.

Can i do this directly from cli, and if so how?

Thx

50 views and noone knows?

Sounds an awful lot like homework.
Try reading these
http://rute.2038bug.com/index.html.gz
http://tldp.org/LDP/Bash-Beginners-G...tml/index.html

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Ouch that's a lot of stuff i don't have time to go over atm.
I was hopping for a quick solution.
Btw i wish i was that young...

See the LQ rules about homework http://www.linuxquestions.org/linux/rules.html
You don't need to read all the stuff at those links, but will need to reference/search them for techniques to solve your problem; the actual soln will be fairly short.
Try something and show us your code if you get stuck.
We will help you solve your problem, but we won't do your h/w for you.
As someone said, a hand-up, not a hand-out.

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Why do you keep mentioning h/w?! How is my post different than many other in here? I know about those and many other links but i was hopping someone would give me a hand here.
In any case, 6 posts with no info.

Check out this post of mine for one possible solution.

The reason why is a lot of us have been at school and been given that exact or nearly exact question, there aren't a lot of functional uses for data like that like other than homework.

As suggested by the previous poster give us some code and if you don't figure it out right away we'll help you get through it...

or describe what you're doing so we understand that this isn't something being used to skip past a homework assignment or for a nefarious purpose (this kind of output would be useful for example brute forcing a password of known length as a dictionary, and generation rules.)

Age has little to do with it being homework, as many 50 year olds ask for help with homework or for help on something they don't understand as 13 year olds, people goto school at all ages these days

This is exactly why i need it, though it is not for nefarious purpose as i am trying to test some security solutions i do for job as a network engineer. The automated process was done with windows; since we moved away to linux/freeBSD i am trying to relearn the steps i took for granted.

Still that link above looks promising, thx.

You'll need to generate random numbers using something like $RANDOM
You'll need to convert the random numbers to the right range using %
You'll need something like printf to get ascii characters from the numbers
You'll need to set up tests for disallowed combinations.
.
.
.
Quick? NO
Easy? Maybe
Straightforward? Yes

I got hung up trying the remember all the syntax of printf---eg:
printf \\141 gives "a" (141 being the octal value)----if only something like $RANDOM would work in octal.....