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Re: "here strings" and tmpfiles


From: konsolebox
Subject: Re: "here strings" and tmpfiles
Date: Tue, 9 Apr 2019 22:07:06 +0800

On Wed, Mar 20, 2019 at 9:05 AM Robert Elz <address@hidden> wrote:
> Note: I am not suggesting bash should change - using files for here docs
> is the way they were originally implemented (in the Bourne sh) (though it
> had bugs, which could leave the files lying around in some cases).
>
> However, using files for here docs makes here docs unusable in a shell
> running in single user mode with no writable filesystems (whatever is
> mounted is read only, until after file system checks are finished).

Here docs and here strings are rarely used in pre-rw boot scripts, and
in my opinion should be avoided, but if it's necessary, an initramfs
should be used.  Some users can also mount /tmp as tmpfs earlier if
they know what they are doing.

Perhaps bash can also look at /dev/shm. It's a common tmpfs, but I
haven't checked if it's standard and what utility mounts it.  I don't
really use it.

Again to be clear, I'm against here * being used or viewed as seekable files.

-- konsolebox



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