Move pages under tldr, lint run.sh, update docs

tldr/chgrp

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# chgrp
+
+> Change group ownership of files and directories.
+> More information: <https://www.gnu.org/software/coreutils/chgrp>.
+
+- Change the owner group of a file/directory:
+
+`chgrp {{group}} {{path/to/file_or_directory}}`
+
+- Recursively change the owner group of a directory and its contents:
+
+`chgrp -R {{group}} {{path/to/directory}}`
+
+- Change the owner group of a symbolic link:
+
+`chgrp -h {{group}} {{path/to/symlink}}`
+
+- Change the owner group of a file/directory to match a reference file:
+
+`chgrp --reference={{path/to/reference_file}} {{path/to/file_or_directory}}`