unix - How to custom display prompt in KornShell to show hostname and current directory? -

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I am using KornShell (ksh) on Solaris and currently my PS1 env var:

< hostname: / full / path / copy / p1 = "$ {HOSTNAME}: \ $ {PWD} \ $"

and displays the prompt: Current / directory $

However, I would like to display it: Hostname: $ directory

In other words, I only hostname and current Directory name, i.e. tmp or ~ or public_html etc. What?

By reading to you 

 PS1 = "$ {HOSTNAME}: \ $ { PWD ## * /} \ $ "

tested on the default KS on SunOS 5.8


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