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Re: While and for loops can read all filename when poc.txt have "*"

Subject: Re: While and for loops can read all filename when poc.txt have "*"
Date: Tue, 22 Dec 2020 14:06:06 +0000
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.6.0

(With apologies to the poster as I accidentally commented off-list ...)

On 22/12/2020 07:42, ffvh gfff wrote:
> Machine: x86_64
> OS: linux-gnu
> Compiler: gcc
> Compilation CFLAGS: -g -O2 -fstack-protector-strong -Wformat
> -Werror=format-security -Wall
> uname output: Linux kali 5.7.0-kali1-amd64 #1 SMP Debian 5.7.6-1kali2
> (2020-07-01) x86_64 GNU/Linux
> Machine Type: x86_64-pc-linux-gnu
> Bash Version: 5.1
> Patch Level: 0
> Release Status: release
> command line:
> cat poc.txt | while read i; do echo $i;done

You didn't quote the expansion of $i. Therefore, the results of the expansion are subject to word splitting, with each resulting word being subject to pathname expansion. See https://github.com/koalaman/shellcheck/wiki/SC2086.

> and
> for i in $(cat ~/poc.txt);do echo $i;done
> poc.txt have "*" ,then above loops will read all ~/ filename.
> Also i submit report through 'bashbug' , here is for the working POC.

As before, only this time the results of your command substitution are also subject to word splitting and pathname expansion. See https://mywiki.wooledge.org/BashPitfalls#pf1.

Neither case demonstrates a bug.

Kerin Millar

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