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        Wed, 23 Nov 2016 01:40:20 -0800 (PST)
Subject: Re: Emulating 'find's print0...
To: zsh-users@zsh.org
References: <20161123072454.GA4898@solfire>
From: Andreas Perstinger <andipersti@gmail.com>
Message-ID: <3fa9ba29-a34a-f5fb-a23a-7bbdbc622da9@gmail.com>
Date: Wed, 23 Nov 2016 10:40:19 +0100
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On 2016-11-23 08:24, Meino.Cramer@gmx.de wrote:
> cat-ting a list of file like so
>
>     cat files.txt | xargs md5sum | sort | .........
>
> fails, if a files name contains blanks.
>
> The tool find circumvent this by using print0
> and xargs understands this via -0.
>
> But I dont want to use find in this case, since the
> list of files (files.txt) are hand made and a manual
> selection of files.
>
> Is there any way to emulate "-print0" efficiently
> (that is: without accessing the drive again) ?

You could use the -I option of xargs:

$ cat files.txt
test 1
test2
test with more blanks
$ cat files.txt | xargs -I @ md5sum @ | sort
26ab0db90d72e28ad0ba1e22ee510510  test2
6d7fce9fee471194aa8b5b6e47267f03  test with more blanks
b026324c6904b2a9cb4b88d6d61c81d1  test 1

With "-I replstr", xargs always takes a full line and replaces every 
occurence of "replstr" in the argument list of the utility with that line.

The GNU version of xargs also has the -a option which eliminates the cating:

$ xargs -a files.txt -I @ md5sum @ | sort
26ab0db90d72e28ad0ba1e22ee510510  test2
6d7fce9fee471194aa8b5b6e47267f03  test with more blanks
b026324c6904b2a9cb4b88d6d61c81d1  test 1

Bye, Andreas