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shell random string

Goal

Generate a random string picked from a pattern

Recipe

Build the pattern, the random letter will be taken from it. 
 export ALPHABET="azertyuiopqsdfghjklmwxcvbn";
The length of the string 
 mihamina@pbmiha:~$ echo ${#ALPHABET} 26
Generate a random RANK to pick 
 RANK=$(($RANDOM % ${#ALPHABET}))
Pick one random letter fro the pattern 
 RANK=$(($RANDOM % ${#ALPHABET})); echo ${ALPHABET:$RANK:1}
Build a 20 characters long random string from the pattern 
 RANDSTRING="";  for I in $(seq 1 20) do   RANK=$(($RANDOM % ${#ALPHABET}));    RANDSTRING=${ALPHABET:$RANK:1}${RANDSTRING};  done;  echo $RANDSTRING
Make a function to summarize it 
 function random_string () {     ALPHABET="azertyuiopqsdfghjklmwxcvbn";         RANDSTRING="";      for I in $(seq 1 $1)     do         RANK=$(($RANDOM % ${#ALPHABET}));          RANDSTRING=${ALPHABET:$RANK:1}${RANDSTRING};      done;  } random_string 3 ; echo $RANDSTRING random_string 5 ; echo $RANDSTRING random_string 15; echo $RANDSTRING

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