realpath: add page (#2357)

pages/linux/realpath.md

@@ -0,0 +1,23 @@
+# realpath
+
+> Display the resolved absolute path for a file or directory.
+
+- Display the absolute path for a file or directory:
+
+`realpath {{path/to/file_or_directory}}`
+
+- Require all path components to exist:
+
+`realpath --canonicalize-existing {{path/to/file_or_directory}}`
+
+- Resolve ".." components before symlinks:
+
+`realpath --logical {{path/to/file_or_directory}}`
+
+- Disable symlink expansion:
+
+`realpath --no-symlinks {{path/to/file_or_directory}}`
+
+- Suppress error messages:
+
+`realpath --quiet {{path/to/file_or_directory}}`