replace with working command

docs/devs/building/unix.md

@@ -65,14 +65,13 @@ You will need a compiler and other tools that could be installed with `build-ess
 
 Also you will need a bunch of development libraries:
 
-	sudo apt-get install << EOF
-	    libboost-date-time-dev
-	    libboost-filesystem-dev
-	    libboost-program-options-dev
-	    libboost-system-dev
-	    libssl-dev
+	sudo apt-get install \
+	    libboost-date-time-dev \
+	    libboost-filesystem-dev \
+	    libboost-program-options-dev \
+	    libboost-system-dev \
+	    libssl-dev \
 	    zlib1g-dev
-	EOF
 
 If you need UPnP support miniupnpc development library should be installed (don't forget to rerun CMake with needed option):