Mention the environment variables that affect the execution of uniq.
Of particular interest is the fact that LC_COLLATE affects how uniq determines whether lines are equal. This was the subject of a fairly heated debate a year or so ago, and it turns out that the current behaviour is correct and that the standard contained an error. Now that the standard has been corrected by Cor. 1-2002, refer to 1003.1-2001 instead of the 1992 edition in the Standards section.
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@ -35,7 +35,7 @@
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.\" From: @(#)uniq.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd June 6, 1993
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.Dd April 12, 2003
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.Dt UNIQ 1
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.Os
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.Sh NAME
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@ -121,6 +121,17 @@ Case insensitive comparison of lines.
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.\"is a
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.\"number.
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.El
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.Sh ENVIRONMENT
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The
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.Ev LANG ,
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.Ev LC_ALL ,
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.Ev LC_COLLATE
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and
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.Ev LC_CTYPE
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environment variables affect the execution of
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.Nm
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as described in
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.Xr environ 7 .
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.Sh DIAGNOSTICS
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.Ex -std
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.Sh COMPATIBILITY
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@ -134,9 +145,9 @@ options have been deprecated but are still supported in this implementation.
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.Sh STANDARDS
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The
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.Nm
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utility is expected to be
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.St -p1003.2
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compatible.
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utility conforms to
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.St -p1003.1-2001
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as amended by Cor. 1-2002.
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.Sh HISTORY
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A
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.Nm
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