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Diff for /src/usr.bin/join/join.1 between version 1.5 and 1.6

version 1.5, 1998/09/26 19:54:55

version 1.6, 1999/07/04 11:53:55

Line 56

.Ar file1

.Ar file2

.Sh DESCRIPTION

The join utility performs an ``equality join'' on the specified files

The

.Nm

utility performs an

.Dq equality join

on the specified files

and writes the result to the standard output.

The ``join field'' is the field in each file by which the files are compared.

The

.Dq join field

is the field in each file by which the files are compared.

The first field in each line is used by default.

There is one line in the output for each pair of lines in

.Ar file1

Line 76

Line 82

The default output field separator is a single space character.

.Pp

Many of the options use file and field numbers.

Both file numbers and field numbers are 1 based, i.e. the first file on

Both file numbers and field numbers are 1 based, i.e., the first file on

the command line is file number 1 and the first field is field number 1.

The following options are available:

.Bl -tag -width Fl

Line 104

Line 110

is a file number and

.Ar field

is a field number.

The elements of list must be either comma (``,'') or whitespace separated.

The elements of list must be either comma

.Pq Ql \&,

or whitespace separated.

(The latter requires quoting to protect it from the shell, or, a simpler

approach is to use multiple

.Fl o

Line 141

Line 149

using the

.Fl b

option, on the fields on which they are to be joined, otherwise

.Nm join

.Nm

may not report all field matches.

When the field delimiter characters are specified by the

.Fl t

Line 155

Line 163

.Ar file1

.Ar file2

is ``-'', the standard input is used.

.Ql \&- ,

the standard input is used.

.Pp

The

.Nm join

.Nm

utility exits 0 on success or >0 if an error occurred.

.Sh COMPATIBILITY

For compatibility with historic versions of

Line 170

Line 180

in both file 1 and file 2.

(To distinguish between this and

.Fl a Ar file_number ,

.Nm join

.Nm

currently requires that the latter not include any white space.)

.It Fl j1 Ar field

Join on the

Line 186

Line 196

field of both file 1 and file 2.

.It Fl o Ar list ...

Historical implementations of

.Nm join

.Nm

permitted multiple arguments to the

.Fl o

option.

These arguments were of the form ``file_number.field_number'' as described

These arguments were of the form

for the current

.Dq file_number.field_number

as described for the current

.Fl o

option.

This has obvious difficulties in the presence of files named ``1.2''.

This has obvious difficulties in the presence of files named

.Dq 1.2 .

.El

.Pp

These options are available only so historic shell scripts don't require

modification and should not be used.

.Sh STANDARDS

The

.Nm join

.Nm

command is expected to be

.St -p1003.2

compatible.