application/
!application/language/gr/

# you can skip this first one if it is not already excluded by prior patterns
!application/

application/*
!application/language/

application/language/*
!application/language/gr/

--------------------------------------------------------------
     $ cat .gitignore
     # exclude everything except directory foo/bar
     /*
     !/foo
     /foo/*
     !/foo/bar
 --------------------------------------------------------------

application/*
!application/**/
application/language/*
!application/language/**/
!application/language/gr/**

application/
!application/language/gr/

# assuming the root folder you want to ignore is 'application'
application/**/*

# the subfolder(s) you want to track:
!application/language/gr/

# assuming the root folder you want to ignore is 'application'
application/**

# Explicitly track certain content nested in the 'application' folder:
!application/language/
!application/language/gr/
!application/language/gr/** # Example adding all files & folder in the 'gr' folder
!application/language/gr/SomeFile.txt # Example adding specific file in the 'gr' folder

# Ignore all directories, and all sub-directories, and it's contents:
*/*

#Now ignore all files in the current directory 
#(This fails to ignore files without a ".", for example 
#'file.txt' works, but 
#'file' doesn't):
*.*

#Only Include these specific directories and subdirectories:
!wordpress/
!wordpress/*/
!wordpress/*/wp-content/
!wordpress/*/wp-content/themes/
!wordpress/*/wp-content/themes/*
!wordpress/*/wp-content/themes/*/*
!wordpress/*/wp-content/themes/*/*/*
!wordpress/*/wp-content/themes/*/*/*/*
!wordpress/*/wp-content/themes/*/*/*/*/*

*
*/*
**/**

**/node_modules/*
!**/node_modules/keep-dir

!node_modules/

node_modules/*
!node_modules/module-a/

!/.vs/              <== include this folder to source control, folder only, nothing else
/.vs/*              <== but ignore all files and sub-folder inside this folder
!/.vs/ProjectSettings.json <== but include this file to source control
!/.vs/config/       <== then include this folder to source control, folder only, nothing else
!/.vs/config/*      <== then include all files inside the folder

# ignore all .dll files
*.dll

# include everything
!*

*
!public
!.gitignore

*
!.gitignore
!public/
!public/*/
!public/products/
!public/products/*
!public/products/*/
!public/products/*/
!public/products/*/*

git add /path/to/module