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You didn't mention the shell you are using. Anyhow, with a recent bash, tryRD=( {A..Z} {a..z} )
echo ${RD[$((RANDOM%52))]}${RD[$((RANDOM%52))]}${RD[$((RANDOM%52))]}${RD[$((RANDOM%52))]}
jTyG

Thread closed, continue here:

https://www.unix.com/linux/255080-small-problem.html

Lets focus on: the other one:
https://www.unix.com/linux/255080-small-problem.html

It is so, unpolite, inadequat, and unhelpfull to open multiple threads of the very same issue.

And, its...

Is it homework?

Hello,

Per our forum rules (https://www.unix.com/misc.php?do=cfrules), all threads must have a descriptive subject text. For example, do not post questions with subjects like "Help Me!",...