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Re: RFC: turn off word splitting for vars but keep for read
From: |
Pierre Gaston |
Subject: |
Re: RFC: turn off word splitting for vars but keep for read |
Date: |
Fri, 22 Nov 2013 17:07:23 +0200 |
On Fri, Nov 22, 2013 at 8:00 AM, Aleksey Midenkov <midenok@gmail.com> wrote:
> Since word splitting in vars is used not more frequently than never,
> protecting all vars in scripts with double quotes is quite unpleasant
> thing. Therefore, I want exactly this behavior always to be in my
> scripts:
>
> $ IFS=""
> $ f() { echo $1; }; x="a b c"; f $x
> a b c
>
> But, IFS influences `read`, which of course benefits from word
> splitting. In light of that conflict, I propose two possible
> solutions:
>
> 1: shopt -s unsplit_vars
>
> which will turn off word splitting for var expansion.
>
> or 2: new IFS2 var that will override IFS for `read` (i.e. `read` will
> use IFS2 when IFS is unset).
>
Your code is still not safe, you would need set -f to disable globing too.
it's easy enough to set IFS locally for read, just set it in its
environment like
IFS=' ' read a b <<"hello world"
- RFC: turn off word splitting for vars but keep for read, Aleksey Midenkov, 2013/11/22
- Re: RFC: turn off word splitting for vars but keep for read,
Pierre Gaston <=
- Re: RFC: turn off word splitting for vars but keep for read, Aleksey Midenkov, 2013/11/22
- Re: RFC: turn off word splitting for vars but keep for read, Eric Blake, 2013/11/22
- Re: RFC: turn off word splitting for vars but keep for read, Pierre Gaston, 2013/11/22
- Re: RFC: turn off word splitting for vars but keep for read, Aleksey Midenkov, 2013/11/22
- Re: RFC: turn off word splitting for vars but keep for read, Bob Proulx, 2013/11/24
- Re: RFC: turn off word splitting for vars but keep for read, Greg Wooledge, 2013/11/25
- Re: RFC: turn off word splitting for vars but keep for read, Bob Proulx, 2013/11/25
- Re: RFC: turn off word splitting for vars but keep for read, Eduardo A . Bustamante López, 2013/11/22
Re: RFC: turn off word splitting for vars but keep for read, Greg Wooledge, 2013/11/22
Re: RFC: turn off word splitting for vars but keep for read, Peggy Russell, 2013/11/22