From mboxrd@z Thu Jan  1 00:00:00 1970
From: Harald Hoyer <harald-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH] emergency_shell: Use '\W' in $PS1 variable to show current
 working directory.
Date: Tue, 12 Mar 2013 09:44:53 +0100
Message-ID: <513EEB05.9050706@redhat.com>
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To: WANG Chao <chaowang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: initramfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org

Am 12.03.2013 06:01, schrieb WANG Chao:
> Signed-off-by: WANG Chao <chaowang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  modules.d/98systemd/dracut-emergency.sh | 2 +-
>  modules.d/99base/dracut-lib.sh          | 4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/modules.d/98systemd/dracut-emergency.sh b/modules.d/98systemd/dracut-emergency.sh
> index a0a4b12..af8daf2 100755
> --- a/modules.d/98systemd/dracut-emergency.sh
> +++ b/modules.d/98systemd/dracut-emergency.sh
> @@ -29,7 +29,7 @@ if getargbool 1 rd.shell -d -y rdshell || getarg rd.break -d rdbreak; then
>      echo
>      echo
>      [ -f /etc/profile ] && . /etc/profile
> -    [ -z "$PS1" ] && export PS1="$_name:\${PWD}# "
> +    [ -z "$PS1" ] && export PS1="$_name:\W# "
>      exec sh -i -l
>  else
>      warn "$action has failed. To debug this issue add \"rd.shell rd.debug\" to the kernel command line."
> diff --git a/modules.d/99base/dracut-lib.sh b/modules.d/99base/dracut-lib.sh
> index d2c803a..e96411e 100755
> --- a/modules.d/99base/dracut-lib.sh
> +++ b/modules.d/99base/dracut-lib.sh
> @@ -906,7 +906,7 @@ _emergency_shell()
>      local _name="$1"
>      if [ -n "$DRACUT_SYSTEMD" ]; then
>          > /.console_lock
> -        echo "PS1=\"$_name:\${PWD}# \"" >/etc/profile
> +        echo "PS1=\"$_name:\W# \"" >/etc/profile
>          systemctl start dracut-emergency.service
>          rm -f /etc/profile
>          rm -f /.console_lock
> @@ -924,7 +924,7 @@ _emergency_shell()
>          echo
>          echo 'Dropping to debug shell.'
>          echo
> -        export PS1="$_name:\${PWD}# "
> +        export PS1="$_name:\W# "
>          [ -e /.profile ] || >/.profile
>  
>          _ctty="$(RD_DEBUG= getarg rd.ctty=)" && _ctty="/dev/${_ctty##*/}"
> 

\W does not work with dash.
Maybe you want:

export PS1="[$_name:\${PWD##*/}]# "