Random Password generator with 2 digits and 6 characters


 
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# 8  
Old 09-28-2018
Another option:

Code:
LC_ALL=C tr -dc '[:alnum:]' < /dev/random | fold -w1 | awk ' 
{
  if(/^[[:digit:]]$/) {
    if(n>=2)
      next
    n++
  }
  else {
    if(m>=6)
      next
    m++
  }
}
{
  s=s $1
} 
(n+m)==8 {
  exit
}
END { 
  print s
}'

Note I suggest using /dev/random here which may pause waiting for entropy but should give more random results...

Last edited by Scrutinizer; 09-28-2018 at 07:09 PM..
These 2 Users Gave Thanks to Scrutinizer For This Post:
# 9  
Old 09-28-2018
Hi Scrutinizer,
I like your code better than mine. But if my dd was terminating on a SIGPIPE signal and generating an unwanted diagnostic for infernalhell, I don't see why the fold in your pipeline wouldn't suffer from the same fate.

Given that PIPE_BUF has a minimum allowed size of 512 bytes, using the following:
Code:
dd cbs=1 conv=unblock ibs=256 count=1

instead of:
Code:
fold -w1

might avoid the diagnostic message. But, of course, if 2 numeric characters and 6 alphabetic characters aren't found in the first 256 alphanumeric characters found in the data in /dev/random you won't get any output from your script. I would expect the likelihood of that happening being less than 3%.
# 10  
Old 09-29-2018
Moderator's Comments:
Mod Comment Thread title changed from "Random Passowrd generator with 2 digits and 6 characters" to "Random Password generator with 2 digits and 6 characters" hoping to make similar topic lookups work better.
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