From 8a805a0636bd305bf07b7c7d59a97cce087d1dae Mon Sep 17 00:00:00 2001
From: Alexander Mahr <info@alexmahr.de>
Date: Sat, 28 Dec 2024 15:11:07 +0100
Subject: [PATCH] add info to 02.variables

---
 02.variables/Makefile | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/02.variables/Makefile b/02.variables/Makefile
index a8b5f6f..30d7ca9 100644
--- a/02.variables/Makefile
+++ b/02.variables/Makefile
@@ -6,8 +6,11 @@ VAR2=asdas  agu
 VAR3=asdas  agu
 # according to https://stackoverflow.com/a/649255/1711186 it is not possible to
 # have newlines being part of a Makefile variable
+# CORRECTION there should be indeed a wat to have "newlines" be stored in a 
+# makefile variable see GNU make docu https://www.gnu.org/software/make/manual/html_node/Multi_002dLine.html
 VAR4='asdas  \
 agu'
+FILE:=file
 
 all: file1 file2 file3 file4
 
@@ -22,3 +25,16 @@ file3:
 
 file4:
 	echo "$(VAR4)" > $@
+
+# Variables can be used for the target of recepies 
+$(FILE)-li:
+	touch $@
+
+
+# bottom line the use of variables might feel a bit annoying in
+# paritcular for the bash/shell programmers as it uses the same
+# "$" indicator but then oftentime $(VARNAME) 
+# it is possible to use ${VARNAME}, 
+# as a "price" the use of $ in the "recipe" part of a rule the us of shell variabls requires
+# to use $$SHELVAR
+