ea8622a4ce
POSIX says that -c specifies a number of bytes, not characters. This flag is commonly used by scripts that operate on binary files to things like extract a header. Treating the offsets as character offsets will break things in mysterious ways. Instead, add a -m option (chosen to match `wc -m`, which also operates on characters) to handle character offsets.
54 lines
885 B
Groff
54 lines
885 B
Groff
.Dd 2015-10-08
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.Dt TAIL 1
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.Os sbase
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.Sh NAME
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.Nm tail
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.Nd display final lines of files
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.Sh SYNOPSIS
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.Nm
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.Op Fl f
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.Op Fl c Ar num | Fl m Ar num | Fl n Ar num | Fl Ns Ar num
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.Op Ar file ...
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.Sh DESCRIPTION
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.Nm
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writes the last 10 lines of each
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.Ar file
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to stdout. If no
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.Ar file
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is given,
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.Nm
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reads from stdin.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl c Ar num | Fl m Ar num | Fl n Ar num | Fl Ns Ar num
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Display final
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.Ar num
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bytes | characters | lines |
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lines. If
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.Ar num
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begins with '+'
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it is an offset from the beginning of each
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.Ar file .
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If
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.Ar num
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begins with '-' it is as if no sign was given. The default is 10 lines.
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.It Fl f
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If one
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.Ar file
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is specified, append lines to output as
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.Ar file
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grows.
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.El
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.Sh SEE ALSO
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.Xr head 1
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.Sh STANDARDS
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The
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.Nm
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utility is compliant with the
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.St -p1003.1-2013
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specification.
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.Pp
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The
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.Op Fl Ns Ar num
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syntax is an extension to that specification.
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