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digraph G {
 
subgraph cluster_0 {
style=filled;
color=lightgrey;
node [style=filled,color=white];
a0 -> a1 -> a2 -> a3;
label = "process #1";
}
 
subgraph cluster_1 {
node [style=filled];
b0 -> b1 -> b2 -> b3;
label = "process #2";
color=blue
}
start -> a0;
start -> b0;
a1 -> b3;
b2 -> a3;
a3 -> a0;
a3 -> end;
b3 -> end;
 
start [shape=Mdiamond];
end [shape=Msquare];
}

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dot -Tpng cluster.dot -o cluster.png

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digraph unix {
size="6,6";
node [color=lightblue2, style=filled];
"5th Edition" -> "6th Edition";
"5th Edition" -> "PWB 1.0";
"6th Edition" -> "LSX";
"6th Edition" -> "1 BSD";
"6th Edition" -> "Mini Unix";
"6th Edition" -> "Wollongong";
"6th Edition" -> "Interdata";
"Interdata" -> "Unix/TS 3.0";
"Interdata" -> "PWB 2.0";
"Interdata" -> "7th Edition";
"7th Edition" -> "8th Edition";
"7th Edition" -> "32V";
"7th Edition" -> "V7M";
"7th Edition" -> "Ultrix-11";
"7th Edition" -> "Xenix";
"7th Edition" -> "UniPlus+";
"V7M" -> "Ultrix-11";
"8th Edition" -> "9th Edition";
"1 BSD" -> "2 BSD";
"2 BSD" -> "2.8 BSD";
"2.8 BSD" -> "Ultrix-11";
"2.8 BSD" -> "2.9 BSD";
"32V" -> "3 BSD";
"3 BSD" -> "4 BSD";
"4 BSD" -> "4.1 BSD";
"4.1 BSD" -> "4.2 BSD";
"4.1 BSD" -> "2.8 BSD";
"4.1 BSD" -> "8th Edition";
"4.2 BSD" -> "4.3 BSD";
"4.2 BSD" -> "Ultrix-32";
"PWB 1.0" -> "PWB 1.2";
"PWB 1.0" -> "USG 1.0";
"PWB 1.2" -> "PWB 2.0";
"USG 1.0" -> "CB Unix 1";
"USG 1.0" -> "USG 2.0";
"CB Unix 1" -> "CB Unix 2";
"CB Unix 2" -> "CB Unix 3";
"CB Unix 3" -> "Unix/TS++";
"CB Unix 3" -> "PDP-11 Sys V";
"USG 2.0" -> "USG 3.0";
"USG 3.0" -> "Unix/TS 3.0";
"PWB 2.0" -> "Unix/TS 3.0";
"Unix/TS 1.0" -> "Unix/TS 3.0";
"Unix/TS 3.0" -> "TS 4.0";
"Unix/TS++" -> "TS 4.0";
"CB Unix 3" -> "TS 4.0";
"TS 4.0" -> "System V.0";
"System V.0" -> "System V.2";
"System V.2" -> "System V.3";
}

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dot -Tpng unix.dot -o unix.png