2015-10-08 15:15:08 +00:00
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.Dd 2015-10-08
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2015-04-20 10:23:20 +00:00
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.Dt JOIN 1
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.Os sbase
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.Sh NAME
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.Nm join
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.Nd relational database operator
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.Sh SYNOPSIS
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.Nm
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.Op Fl 1 Ar field
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.Op Fl 2 Ar field
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.Op Fl o Ar list
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.Op Fl e Ar string
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.Op Fl a Ar fileno | Fl v Ar fileno
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.Op Fl t Ar delim
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.Ar file1 file2
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.Sh DESCRIPTION
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.Nm
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lines from
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.Ar file1
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and
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.Ar file2
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on a matching field. If one of the input files is '-', standard input
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is read for that file.
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.Pp
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Files are read sequentially and are assumed to be sorted on the join
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field.
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.Nm
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does not check the order of input, and joining two unsorted files will
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produce unexpected output.
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.Pp
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By default, input lines are matched on the first blank-separated
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field; output lines are space-separated and consist of the join field
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followed by the remaining fields from
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.Ar file1 Ns ,
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then the remaining fields from
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.Ar file2 Ns .
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl 1 Ar field
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Join on the
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2015-05-01 17:41:14 +00:00
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.Ar field Ns th
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2015-04-20 10:23:20 +00:00
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field of file 1.
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.It Fl 2 Ar field
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Join on the
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2015-05-01 17:41:14 +00:00
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.Ar field Ns th
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2015-04-20 10:23:20 +00:00
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field of file 2.
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.It Fl a Ar fileno
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Print unpairable lines from file
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.Ar fileno
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in addition to normal output.
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.It Fl e Ar string
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When used with
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.Fl o Ns ,
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replace empty fields in the output list with
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.Ar string Ns .
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.It Fl o Ar list
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Format output according to the string
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.Ar list Ns .
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Each element of
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.Ar list
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may be either
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.Ar fileno.field
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or 0 (representing the join field).
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Elements in
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.Ar list
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may be separated by blanks or commas. For example,
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.Bd -literal -offset indent
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join -o "0 2.1 1.3"
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.Ed
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.Pp
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would print the join field, the first field of
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.Ar file2 Ns ,
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then the third field of
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.Ar file1 Ns .
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.Pp
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Only paired lines are formatted with the
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.Fl o
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option. Unpairable lines (selected with
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.Fl a
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or
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.Fl v Ns )
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are printed raw.
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.It Fl t Ar delim
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Use the arbitrary string
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.Ar delim
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as field delimiter for both input and output.
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.It Fl v Ar fileno
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Print unpairable lines from file
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.Ar fileno
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instead of normal output.
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.El
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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 with the following exeption:
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.Bl -bullet -offset indent
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.It
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Unpairable lines ignore formatting specified with
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.Fl o Ns .
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.El
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.Pp
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The possibility of specifying multibyte delimiters of arbitrary
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length is an extension to the specification.
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