funciona

.classpath

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

.project

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>MiCat</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

README.md

@@ -1,2 +1,10 @@
 # 05MiCat
 
+java MiCat ruta
+
+Solo se escribe Esto es una prueba
+
+```
+Escribe algo
+Esto es una prueba\ no se muestra
+```

src/es/antoniotgit/MiCat.java

@@ -0,0 +1,39 @@
+package es.antoniotgit;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Scanner;
+
+public class MiCat {
+
+	
+public static void main(String[] args) throws IOException{
+		
+		Scanner lector = new Scanner(System.in);
+
+        String path = args[0];
+
+        File fichero = new File(path);
+
+        FileWriter fic = new FileWriter(fichero, true);
+
+        String fin = "\\";
+        
+        System.out.println("Escribe algo");
+        String texto = lector.nextLine();
+
+        for (int i = 0; i < texto.length(); i++) {
+            String caracter = String.valueOf(texto.charAt(i));
+
+            if (caracter.equalsIgnoreCase(fin)) {
+                fic.close();
+            } else {
+                fic.write(caracter);
+            }
+        }
+
+        fic.close();
+	}
+
+}