Re: Some question regarding tail and option "-c" (original) (raw)

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From: Robert Milasan
Subject: Re: Some question regarding tail and option "-c"
Date: Thu, 4 Oct 2012 09:32:47 +0200

On Wed, 03 Oct 2012 20:09:26 +0200 "Jim Meyering" <address@hidden> wrote:

There is some documentation on the effects of that variable in "info coreutils":

2.13 Standards conformance ==========================

In a few cases, the GNU utilities' default behavior is incompatible with the POSIX standard. To suppress these incompatibilities, define the POSIXLYCORRECT' environment_ _variable. Unless you are checking for POSIX conformance, you_ _probably do not need to define POSIXLYCORRECT'.

Newer versions of POSIX are occasionally incompatible with older versions. For example, older versions of POSIX required the command sort +1' to sort based on the second and succeeding fields_ _in each input line, but starting with POSIX 1003.1-2001 the same_ _command is required to sort the file named +1', and you must instead use the command `sort -k 2' to get the field-based sort.

The GNU utilities normally conform to the version of POSIX that is standard for your system. To cause them to conform to a different version of POSIX, define the POSIX2VERSION' environment_ _variable to a value of the form YYYYMM specifying the year and month_ _the standard was adopted. Three values are currently supported for_ _POSIX2VERSION': 199209' stands for POSIX 1003.2-1992, 200112' stands for POSIX 1003.1-2001, and 200809' stands for POSIX_ _1003.1-2008. For example, if you have a newer system but are running_ _software that assumes an older version of POSIX and uses sort +1' or tail +10', you can work around any compatibility problems by setting_ _POSIX2VERSION=199209' in your environment.

This doesn't make sense, I can reproduce this on openSUSE 12.1 and 12.2 with coreutils 8.14 and 8.16. I don't think we are using some old POSIX standard.

-- Robert Milasan

L3 Support Engineer SUSE Linux email: address@hidden GPG fingerprint: B6FE F4A8 0FA3 3040 3402 6FE7 2F64 167C 1909 6D1A