Join lines on a common field, writes to standard output a line for each pair of input lines that have identical join fields.

SYNTAX
      join [Options]... File1 File2

Description

Either FILE1 or FILE2 (but not both) can be `-‘, meaning standard input. FILE1 and FILE2 should be already sorted in increasing textual order on the join fields, using the collating sequence specified by the `LC_COLLATE’ locale.

Unless the `-t’ option is given, the input should be sorted ignoring blanks at the start of the join field, as in `sort -b’. If the `–ignore-case’ option is given, lines should be sorted without regard to the case of characters in the join field, as in `sort
-f’.

The defaults are:
The join field is the first field in each line;
Fields in the input are separated by one or more blanks, with leading blanks on the line ignored;
Fields in the output are separated by a space;
Each output line consists of the join field, the remaining fields from FILE1, then the remaining fields from FILE2.

OPTIONS

-a FILE-NUMBER
     Print a line for each unpairable line in file FILE-NUMBER (either
     `1' or `2'), in addition to the normal output.

-e STRING
     Replace those output fields that are missing in the input with
     STRING.

-i
--ignore-case
     Ignore differences in case when comparing keys.  With this option,
     the lines of the input files must be ordered in the same way.  Use
     `sort -f' to produce this ordering.

-1 FIELD
-j1 FIELD
     Join on field FIELD (a positive integer) of file 1.

-2 FIELD
-j2 FIELD
     Join on field FIELD (a positive integer) of file 2.

-j FIELD
     Equivalent to `-1 FIELD -2 FIELD'.

-o FIELD-LIST...
     Construct each output line according to the format in FIELD-LIST.
     Each element in FIELD-LIST is either the single character `0' or
     has the form M.N where the file number, M, is `1' or `2' and N is
     a positive field number.

     A field specification of `0' denotes the join field.  In most
     cases, the functionality of the `0' field spec can be reproduced
     using the explicit M.N that corresponds to the join field.
     However, when printing unpairable lines (using either of the `-a'
     or `-v' options), there is no way to specify the join field using
     M.N in FIELD-LIST if there are unpairable lines in both files.  To
     give `join' that functionality, POSIX invented the `0' field
     specification notation.

     The elements in FIELD-LIST are separated by commas or blanks.
     Multiple FIELD-LIST arguments can be given after a single `-o'
     option; the values of all lists given with `-o' are concatenated
     together.  All output lines - including those printed because of
     any -a or -v option - are subject to the specified FIELD-LIST.

-t CHAR
     Use character CHAR as the input and output field separator.

-v FILE-NUMBER
     Print a line for each unpairable line in file FILE-NUMBER (either
     `1' or `2'), instead of the normal output.

 

Related linux commands:

csplit – Split a file into context-determined pieces
cut – Divide a file into several parts
fmt – Reformat paragraph text
fold – Wrap input lines to fit in specified width
head – Output the first part of file(s)
paste – Merge lines of files
split – Split a file into fixed-size pieces
tail – Output the last part of files
Equivalent Windows command: FC – Compare two files

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