password is 12 characters long

crunch 10 10` + `'sed' 's/^/11/'

password only contains numbers

crunch 10 10 123456780

if you are using crunch, than 2@ (123456 is good, 123345 is good, 123334 is not good) + password starts with 11 + only one pair of digits (e.g. 99456)

'sed' 's/^/11/'

password does not contain 9 + password contains one 8 + seventh digit is 8

crunch 10 10 123456780` + `'grep' "^....8"

3 digits appear more than once

[ `echo $LINE | sed 's/\(.\)/\1\n/g' | sort | uniq -c | awk '{if($1 > 1) print $1}' | wc -l` -eq 3 ] &&  echo $LINE; done

third digit is smaller than 5

'grep' "^[0234]"

last digit is larger than 5

'grep' "[67]$"