App::CSVUtils::csv_cmp - Compare two CSV files value by value
This document describes version 1.034 of App::CSVUtils::csv_cmp (from Perl distribution App-CSVUtils), released on 2024-02-02.
Usage:
csv_cmp(%args) -> [$status_code, $reason, $payload, \%result_meta]
Compare two CSV files value by value.
Examples:
Compare two identical files, will output nothing and exits 0:
csv_cmp(input_filenames => ["file.csv", "file.csv"]);
Compare two CSV files case-insensitively (-i), show detailed report (-l):
csv_cmp( input_filenames => ["file1.csv", "file2.csv"], detail => 1, ignore_case => 1 );
This utility is modelled after the Unix command cmp; it compares two CSV files value by value and ignore quoting (and can be instructed to ignore whitespaces, case difference).
cmp
If all the values of two CSV files are identical, then utility will exit with code 0. If a value differ, this utility will stop, print the difference and exit with code 1.
If -l (--detail) option is specified, all differences will be reported. Note that in cmp Unix command, the -l option is called --verbose. The detailed report is in the form of CSV:
-l
--detail
--verbose
rownum,fieldnum,value1,value2
where rownum begins at 1 (for header row), fieldnum begins at 1 (first field), value1 is the value in first CSV file, value2 is the value in the second CSV file.
rownum
fieldnum
value1
value2
Other notes:
If none of the field selection options are used, it means all fields are included (equivalent to --include-all-fields).
--include-all-fields
Field selection will be performed on the first CSV file, then the indexes will be used for the second CSV file.
This function is not exported.
Arguments ('*' denotes required arguments):
detail => true
Report all differences instead of just the first one.
exclude_field_pat => re
Field regex pattern to exclude, takes precedence over --field-pat.
exclude_fields => array[str]
Field names to exclude, takes precedence over --fields.
ignore_case => bool
Ignore case difference.
ignore_leading_ws => bool
Ignore leading whitespaces.
ignore_trailing_ws => bool
Ignore trailing whitespaces.
ignore_unknown_fields => bool
When unknown fields are specified in --include-field (--field) or --exclude-field options, ignore them instead of throwing an error.
ignore_ws => bool
Ignore leading & trailing whitespaces.
include_field_pat => re
Field regex pattern to select, overidden by --exclude-field-pat.
include_fields => array[str]
Field names to include, takes precedence over --exclude-field-pat.
inplace => true
Output to the same file as input.
Normally, you output to a different file than input. If you try to output to the same file (-o INPUT.csv -O) you will clobber the input file; thus the utility prevents you from doing it. However, with this --inplace option, you can output to the same file. Like perl's -i option, this will first output to a temporary file in the same directory as the input file then rename to the final file at the end. You cannot specify output file (-o) when using this option, but you can specify backup extension with -b option.
-o INPUT.csv -O
--inplace
-i
-o
-b
Some caveats:
if input file is a symbolic link, it will be replaced with a regular file;
renaming (implemented using rename()) can fail if input filename is too long;
rename()
value specified in -b is currently not checked for acceptable characters;
things can also fail if permissions are restrictive;
inplace_backup_ext => str (default: "")
Extension to add for backup of input file.
In inplace mode (--inplace), if this option is set to a non-empty string, will rename the input file using this extension as a backup. The old existing backup will be overwritten, if any.
input_escape_char => str
Specify character to escape value in field in input CSV, will be passed to Text::CSV_XS.
Defaults to \\ (backslash). Overrides --input-tsv option.
\\
--input-tsv
input_filenames => array[filename] (default: ["-"])
Input CSV files.
Use - to read from stdin.
-
Encoding of input file is assumed to be UTF-8.
input_header => bool (default: 1)
Specify whether input CSV has a header row.
By default, the first row of the input CSV will be assumed to contain field names (and the second row contains the first data row). When you declare that input CSV does not have header row (--no-input-header), the first row of the CSV is assumed to contain the first data row. Fields will be named field1, field2, and so on.
--no-input-header
field1
field2
input_quote_char => str
Specify field quote character in input CSV, will be passed to Text::CSV_XS.
Defaults to " (double quote). Overrides --input-tsv option.
"
input_sep_char => str
Specify field separator character in input CSV, will be passed to Text::CSV_XS.
Defaults to , (comma). Overrides --input-tsv option.
,
input_tsv => true
Inform that input file is in TSV (tab-separated) format instead of CSV.
Overriden by --input-sep-char, --input-quote-char, --input-escape-char options. If one of those options is specified, then --input-tsv will be ignored.
--input-sep-char
--input-quote-char
--input-escape-char
output_always_quote => bool (default: 0)
Whether to always quote values.
When set to false (the default), values are quoted only when necessary:
field1,field2,"field three contains comma (,)",field4
When set to true, then all values will be quoted:
"field1","field2","field three contains comma (,)","field4"
output_escape_char => str
Specify character to escape value in field in output CSV, will be passed to Text::CSV_XS.
This is like --input-escape-char option but for output instead of input.
Defaults to \\ (backslash). Overrides --output-tsv option.
--output-tsv
output_filename => filename
Output filename.
Use - to output to stdout (the default if you don't specify this option).
Encoding of output file is assumed to be UTF-8.
output_header => bool
Whether output CSV should have a header row.
By default, a header row will be output if input CSV has header row. Under --output-header, a header row will be output even if input CSV does not have header row (value will be something like "col0,col1,..."). Under --no-output-header, header row will not be printed even if input CSV has header row. So this option can be used to unconditionally add or remove header row.
--output-header
--no-output-header
output_quote_char => str
Specify field quote character in output CSV, will be passed to Text::CSV_XS.
This is like --input-quote-char option but for output instead of input.
Defaults to " (double quote). Overrides --output-tsv option.
output_quote_empty => bool (default: 0)
Whether to quote empty values.
When set to false (the default), empty values are not quoted:
field1,field2,,field4
When set to true, then empty values will be quoted:
field1,field2,"",field4
output_sep_char => str
Specify field separator character in output CSV, will be passed to Text::CSV_XS.
This is like --input-sep-char option but for output instead of input.
Defaults to , (comma). Overrides --output-tsv option.
output_tsv => bool
Inform that output file is TSV (tab-separated) format instead of CSV.
This is like --input-tsv option but for output instead of input.
Overriden by --output-sep-char, --output-quote-char, --output-escape-char options. If one of those options is specified, then --output-tsv will be ignored.
--output-sep-char
--output-quote-char
--output-escape-char
overwrite => bool
Whether to override existing output file.
quiet => true
Do not report, just signal via exit code.
show_selected_fields => true
Show selected fields and then immediately exit.
Returns an enveloped result (an array).
First element ($status_code) is an integer containing HTTP-like status code (200 means OK, 4xx caller error, 5xx function error). Second element ($reason) is a string containing error message, or something like "OK" if status is 200. Third element ($payload) is the actual result, but usually not present when enveloped result is an error response ($status_code is not 2xx). Fourth element (%result_meta) is called result metadata and is optional, a hash that contains extra information, much like how HTTP response headers provide additional metadata.
Return value: (any)
Please visit the project's homepage at https://metacpan.org/release/App-CSVUtils.
Source repository is at https://github.com/perlancar/perl-App-CSVUtils.
perlancar <perlancar@cpan.org>
To contribute, you can send patches by email/via RT, or send pull requests on GitHub.
Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:
% prove -l
If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me.
This software is copyright (c) 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016 by perlancar <perlancar@cpan.org>.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
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.
To install App::CSVUtils, copy and paste the appropriate command in to your terminal.
cpanm
cpanm App::CSVUtils
CPAN shell
perl -MCPAN -e shell install App::CSVUtils
For more information on module installation, please visit the detailed CPAN module installation guide.