bugfindutils - Bugs: bug #58156, Order of xargs -L and -I flags...


bug #58156: Order of xargs -L and -I flags matters

Submitted by:  David Hoese <djhoese>
Submitted on:  Fri 10 Apr 2020 04:12:17 PM UTC  
Category:  xargs Severity:  3 - Normal
Item Group:  Wrong result Status:  Duplicate
Privacy:  Public Assigned to:  Bernhard Voelker <berny>
Originator Name:  Open/Closed:  Open
Release:  4.5.11 Fixed Release:  None

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Mon 04 Jan 2021 11:28:37 PM UTC, comment #1: 

Marking this as a duplicate of

Bernhard Voelker <berny>
Project AdministratorIn charge of this item.
Fri 10 Apr 2020 04:12:17 PM UTC, original submission:  

I know the BUGS section of the man page mentions "The -L option is incompatible with the -I option, but perhaps should not be." So while I would expect the combination of the two to never work given that sentence in the man page, some coworkers have apparently been using them together for years. Here's an example with a three line file:

$ cat test.txt | xargs -I{} -L1 bash -c "echo {}"
$ cat test.txt | xargs -L1 -I{} bash -c "echo {}"

It seems the order of the -L and -I arguments determines the output which was unexpected. This has been noticed on the xargs that comes with CentOS 6/7 and Ubuntu, but the BSD version that comes with OSX seems to not depend on the order.

Version info:

$ xargs --version
xargs (GNU findutils)
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Eric B. Decker, James Youngman, and Kevin Dalley.

David Hoese <djhoese>


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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2021-01-04 berny StatusNone => Duplicate
        Assigned toNone => berny
    2020-04-10 djhoese Carbon-Copy- => Added rayg@

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