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I'm wanting to add the previous command's history number to my prompt, as well as the exit code.

At present,

%h[%?]

Gives me the current history number, as well as the last exit code. What I'd really like is an expansion for %h-1, but I'm not sure if that is possible?

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up vote 4 down vote accepted

The answer, courtesy of /r/commandline on Reddit is:

 PS1='$[HISTCMD-1][%?] %#'
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