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doc: uniq: clarify -f operation

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* doc/coreutils.texi (uniq invocation): State that leading blanks
are part of the field, and also that -f is one based.
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Pádraig Brady
2022-08-01 21:55:12 +01:00
parent ab976f4090
commit 993f0d968d
1 changed files with 4 additions and 3 deletions
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doc/coreutils.texi
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@@ -5201,9 +5201,10 @@ The program accepts the following options. Also see @ref{Common options}.
@opindex -f
@opindex --skip-fields
Skip @var{n} fields on each line before checking for uniqueness. Use
a null string for comparison if a line has fewer than @var{n} fields. Fields
are sequences of non-space non-tab characters that are separated from
each other by at least one space or tab.
a null string for comparison if a line has fewer than @var{n} fields.
Fields are a sequence of blank characters followed by non-blank characters.
Field numbers are one based, i.e., @option{-f 1} will skip the first
field (which may optionally have leading blanks).
For compatibility @command{uniq} supports a traditional option syntax
@option{-@var{n}}. New scripts should use @option{-f @var{n}} instead.