language agnostic - What exactly does the word Patch mean when referring to 'submitting a patch'? -

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what word patch mean when referring 'submitting patch'?

i've seen used lot, in open source world. what mean , involved in submitting patch?

it's file list of differences between code files have changed. it's in format generated doing diff -u on 2 files. version control systems allow easy creation of patches it's in same format.

this allows code change applied else's copy of source code using patch command.

for example:

let's have following code:

<?php   $foo = 0; ?>

and change this:

<?php   $bar = 0; ?>

the patch file might this:

index: test.php =================================================================== --- test.php    (revision 40) +++ test.php    (working copy) @@ -3,7 +3,7 @@          <?php -            $foo = 0; +            $bar= 0;          ?>

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