[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: cat<(echo text) not same as cat <(echo text)
From: |
Clark Wang |
Subject: |
Re: cat<(echo text) not same as cat <(echo text) |
Date: |
Mon, 4 Jun 2018 16:40:12 +0800 |
On Mon, Jun 4, 2018 at 11:48 AM, Edward Huff <ejhuff@gmail.com> wrote:
> That is unexpected.
>
I agree it may look "unexpected" because "cat<file" is the same as "cat
<file". But for "cat<file", '<' is part of input/output redirection but '<'
in "cat<(echo text)" is not. Instead, "<(echo text)" is *process substition*
.
According to bash manual: "On systems that can support it, there is an
additional expansion available: *process substitution*. *This is performed
at the same time as tilde, parameter, variable, and arithmetic expansion
and command substitution.*"
-clark