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csv-setop - Set operation against several CSV files
This document describes version 0.028 of csv-setop (from Perl distribution App-CSVUtils), released on 2019-12-28.
% csv-setop [options] <filenames> ...
# file1.csv a,b,c 1,2,3 4,5,6 7,8,9 # file2.csv a,b,c 1,2,3 4,5,7 7,8,9
Output of intersection (
--intersect file1.csv file2.csv), which will return common rows between the two files:
a,b,c 1,2,3 7,8,9
Output of union (
--union file1.csv file2.csv), which will return all rows with duplicate removed:
a,b,c 1,2,3 4,5,6 4,5,7 7,8,9
Output of difference (
--diff file1.csv file2.csv), which will return all rows in the first file but not in the second:
Output of symmetric difference (
--symdiff file1.csv file2.csv), which will return all rows in the first file not in the second, as well as rows in the second not in the first:
a,b,c 4,5,6 4,5,7
You can specify
--compare-fields to only consider some fields only, for example
--union --compare-fields a,b file1.csv file2.csv:
a,b,c 1,2,3 4,5,6 7,8,9
Each field specified in
--compare-fields can be specified using
F1:F2:... format to refer to different field names or indexes in each file, for example if
# file3.csv Ei,Si,Bi 1,3,2 4,7,5 7,9,8
--union --compare-fields a:Ei,b:Bi file1.csv file3.csv will result in:
a,b,c 1,2,3 4,5,6 7,8,9
Finally you can print out certain fields using
* marks required options.
Shortcut for --op=diff.
- --filename=s@*, -f
Input CSV files.
Use `-` to read from stdin.
Can be specified multiple times.
Input CSV files (JSON-encoded).
- --ignore-case, -i
Shortcut for --op=intersect.
By default (`--header`), the first row of the CSV will be assumed to contain field names (and the second row contains the first data row). When you declare that CSV does not have header row (`--no-header`), the first row of the CSV is assumed to contain the first data row. Fields will be named `field1`, `field2`, and so on.
Set operation to perform.
Shortcut for --op=symdiff.
Inform that input file is in TSV (tab-separated) format instead of CSV.
Shortcut for --op=union.
Choose output format, e.g. json, text.
Set output format to json.
When outputing as JSON, strip result envelope.
By default, when outputing as JSON, the full enveloped result is returned, e.g.:
The reason is so you can get the status (1st element), status message (2nd element) as well as result metadata/extra result (4th element) instead of just the result (3rd element). However, sometimes you want just the result, e.g. when you want to pipe the result for more post-processing. In this case you can use `--naked-res` so you just get:
This script has shell tab completion capability with support for several shells.
To activate bash completion for this script, put:
complete -C csv-setop csv-setop
in your bash startup (e.g. ~/.bashrc). Your next shell session will then recognize tab completion for the command. Or, you can also directly execute the line above in your shell to activate immediately.
It is recommended, however, that you install modules using cpanm-shcompgen which can activate shell completion for scripts immediately.
To activate tcsh completion for this script, put:
complete csv-setop 'p/*/`csv-setop`/'
in your tcsh startup (e.g. ~/.tcshrc). Your next shell session will then recognize tab completion for the command. Or, you can also directly execute the line above in your shell to activate immediately.
It is also recommended to install shcompgen (see above).
For fish and zsh, install shcompgen as described above.
Please visit the project's homepage at https://metacpan.org/release/App-CSVUtils.
Source repository is at https://github.com/perlancar/perl-App-CSVUtils.
Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=App-CSVUtils
When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.
This software is copyright (c) 2019, 2018, 2017, 2016 by email@example.com.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.