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$RANDOM is unusable


From: Heikki Vesalainen
Subject: $RANDOM is unusable
Date: Thu, 16 Jan 2003 14:08:01 +0200 (EET)

GNU bash, version 2.04.11(1)-release (i386-redhat-linux-gnu)
Copyright 1999 Free Software Foundation, Inc.
On Pentium III (Coppermine), 794.719, 255928 kB RAM

The $RANDOM is totally unusable if called with some invariable interval.
The below code is meant to produce random numbers between 1-4, but instead
it just produces a string of form i=i+1; where only the initial value of i
is random.

code:

        while true; do
          sleep 1;
          let RND=$RANDOM%4+1
          echo $RND
        done

output:

4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3

and so on.


Heikki Vesalainen, Mermit
: GSM +358.50.3695362
: address@hidden






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