.TH JOIN 1 "18 January 1983"
join \- relational database operator
forms, on the standard output,
of the two relations specified by the lines of
is `\-', the standard input is used.
must be sorted in increasing ASCII collating
on which they are to be joined,
normally the first in each line.
There is one line in the output
for each pair of lines in
that have identical join fields.
The output line normally consists of the common field,
then the rest of the line from
then the rest of the line from
Fields are normally separated by blank, tab or newline.
In this case, multiple separators count as one, and
leading separators are discarded.
These options are recognized:
In addition to the normal output,
produce a line for each unpairable line in file
Replace empty output fields by string
Each output line comprises the fields specifed in
each element of which has the form
as a separator (tab character).
in a line is significant.
With default field separation,
the collating sequence is that of
the sequence is that of a plain sort.
.I join, sort, comm, uniq, look