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From: Greg Wooledge <wooledg@eeg.ccf.org>
Newsgroups: gnu.bash.bug
Subject: Re: bash 5.0 on AIX 7.2 server -- Division by 0 when using bash from shell window
Date: Mon, 29 Jun 2020 17:32:25 -0400
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On Mon, Jun 29, 2020 at 08:24:01PM +0000, Krongard, William T. (BLM) wrote:
> Description:
>         execution of "bash" from shell window gets a division by zero message
> # bash
> bash: (1-0/roothome1): division by 0 (error token is "roothome1)")
> bash: (1-0/roothome1): division by 0 (error token is "roothome1)")
> 
> every command executed is followed by the division by 0 message

This will be caused by something in your environment -- either the PS1
variable, or the PROMPT_COMMAND variable, or a DEBUG trap, which is being
set in one of root's dot files on your system.

Most probably, you've got $(( )) where you meant to have $( ), or
something along those lines.  It'll probably be obvious once you print
out the contents of the PS1 and PROMPT_COMMAND variables, and the
output of "trap" with no arguments.