sbase/nl.1

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.Dd February 20, 2015
.Dt NL 1
.Os sbase
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.Sh NAME
.Nm nl
.Nd line numbering filter
.Sh SYNOPSIS
.Nm
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.Op Fl b Ar type
.Op Fl i Ar incr
.Op Fl s Ar sep
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.Op Fl v Ar startnum
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.Op Fl w Ar width
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.Op Ar file
.Sh DESCRIPTION
.Nm
reads lines from the named
.Ar file
and writes them to stdout with non-empty lines numbered. If no
.Ar file
is given
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.Nm
reads from stdin.
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl b Ar type
Defines which lines will be numbered:
.Bl -tag -width pstringXX
.It a
All lines.
.It n
No lines.
.It t
Only non-empty lines (default).
.It p Ns Ar expr
Only lines which match
.Ar expr ,
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a regular expression as defined in
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.Xr regex 7 .
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.El
.It Fl i Ar incr
Defines the increment between numbered lines.
.It Fl s Ar sep
Defines the string used to separate line numbers and lines. By default this is
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a tab.
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.It Fl v Ar startnum
Start counting from
.Ar startnum
instead of the default 1.
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.It Fl w Ar width
The number of characters to be occupied by the line number
will be set to
.Ar width .
The default is 6.
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.El
.Sh SEE ALSO
.Xr pr 1