Re: [PATCH v4 1/5] t9300: factor out portable "head -c" replacement

From: Eric Sunshine <sunshine@sunshineco.com>
Date: Jul 1, 2016, 04:45 UTC
Message-ID: <CAPig+cS334=jN54Ab46VoNoD7uzEgLXwaNE1ePZwqgZYja33cw@mail.gmail.com>
In-Reply-To: <20160630090753.GA17463@sigill.intra.peff.net>

On Thursday, June 30, 2016, Jeff King <peff@peff.net> wrote:

Show 13 quoted lines

> In shell scripts it is sometimes useful to be able to read
> exactly N bytes from a pipe. Doing this portably turns out
> to be surprisingly difficult.
>
> We want a solution that:
>
>   - is portable
>
>   - never reads more than N bytes due to buffering (which
>     would mean those bytes are not available to the next
>     program to read from the same pipe)
>
>   - handles partial reads by looping until N bytes or read

s/or/are/

>     (or we see EOF)

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