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Re: [Help-bash] Why `` in PS4='``' is reduced to empty string?
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From: |
Pierre Gaston |
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Subject: |
Re: [Help-bash] Why `` in PS4='``' is reduced to empty string? |
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Date: |
Sun, 10 Dec 2017 08:14:40 +0200 |
On Sun, Dec 10, 2017 at 4:56 AM, Peng Yu <address@hidden> wrote:
> Hi,
>
> It seems that PS4 is interpreted. But this seems not documented.
>
It is documented, it says it is expanded like PS1 and then under PROMPTING
it says it undergoes command substitution.
>
> Also, is it better to perserve PS4 literally without any inpretation?
>
Using variables, eg LINENO or running commands, eg to display the date, can
be useful,