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docs: document transformation of obsolete sort syntax

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* doc/coreutils.texi (sort invocation): Mention the conversion.
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Eric Blake
2010-04-20 16:26:27 -06:00
parent 7dc398a30f
commit a9b904a282
1 changed files with 5 additions and 0 deletions
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doc/coreutils.texi
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@@ -4126,6 +4126,11 @@ is counted from the first nonblank character of the field.
@vindex POSIXLY_CORRECT
On older systems, @command{sort} supports an obsolete origin-zero
syntax @samp{+@var{pos1} [-@var{pos2}]} for specifying sort keys.
The obsolete sequence @samp{sort +@var{a}.@var{x} -@var{b}.@var{y}}
is equivalent to @samp{sort -k @var{a+1}.@var{x+1},@var{b}} if @var{y}
is @samp{0} or absent, otherwise it is equivalent to @samp{sort -k
@var{a+1}.@var{x+1},@var{b+1}.@var{y}}.
This obsolete behavior can be enabled or disabled with the
@env{_POSIX2_VERSION} environment variable (@pxref{Standards
conformance}); it can also be enabled when @env{POSIXLY_CORRECT} is