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# NAME

update - Greple module to update file content

# SYNOPSIS

greple -Mupdate

Options:

    --update       replace file content
    --with-backup  make backup files

    --diff         produce diff output
    --U#           specify unified diff context length

# VERSION

Version 0.03

# DESCRIPTION

This **greple** module substitute the target file content by command
output.  For example, next command replace all words in the file to
uppercase.

    greple -Mupdate '\w+' --cm 'sub{uc}' --update file

Above is a very simple example but you can implement arbitrarily
complex function in conjunction with other various **greple** options.

You can check how the file will be edited by **--diff** option.

    greple -Mupdate '\w+' --cm 'sub{uc}' --diff file

Command **sdif** or **cdif** would be useful to see the difference
visually.

    greple -Mupdate '\w+' --cm 'sub{uc}' --diff file | cdif

This module has been spun off from [App::Greple::subst](https://metacpan.org/pod/App%3A%3AGreple%3A%3Asubst) module.
Consult it for more practical use case.

# OPTIONS

- **--update**
- **--update::update**

    Update the target file by command output.  Entire file content is
    produced and any color effects are canceled.  Without this option,
    **greple** behaves as normal operation, that means only matched lines
    are printed.

    File is not touched as far as its content does not change.

- **--with-backup**\[=_suffix_\]

    Backup original file with `.bak` suffix.  If optional parameter is
    given, it is used as a suffix string.  If the file exists, `.bak_1`,
    `.bak_2` ... are used.

- **--diff**
- **--update::diff**

    Option **-diff** produce diff output of original and converted text.
    Option **-U#** can be used to specify context length.

# INSTALL

## CPANMINUS

    $ cpanm App::Greple::update

## GITHUB

    $ cpanm https://github.com/kaz-utashiro/greple-update.git

# SEE ALSO

[App::Greple](https://metacpan.org/pod/App%3A%3AGreple), [https://github.com/kaz-utashiro/greple](https://github.com/kaz-utashiro/greple)

[App::Greple::update](https://metacpan.org/pod/App%3A%3AGreple%3A%3Aupdate), [https://github.com/kaz-utashiro/greple-update](https://github.com/kaz-utashiro/greple-update)

[App::Greple::subst](https://metacpan.org/pod/App%3A%3AGreple%3A%3Asubst), [https://github.com/kaz-utashiro/greple-subst](https://github.com/kaz-utashiro/greple-subst)

[App::sdif](https://metacpan.org/pod/App%3A%3Asdif), [App::cdif](https://metacpan.org/pod/App%3A%3Acdif)

# AUTHOR

Kazumasa Utashiro

# LICENSE

Copyright 2022 Kazumasa Utashiro.

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
