$ sqlite3 db 'create table exampl (one, two)';
$ sqlite3 -separator $'\t' db 'explain select one from exampl'; | tee ops |head -n 3
0       Goto    0       10      
1       Integer 0       0       
2       OpenRead        0       2   

# Edited output in asc format
$ ./vdbe_graph.pl -f asc ops 
[...]
     +------------------------+
     | 2 OpenRead (0, 2)      |
     +------------------------+
       v
     +------------------------+
     | 3 SetNumColumns (0, 1) |
     +------------------------+
       v
     +------------------------+
     | 4 Rewind (0, 8)        | -+
     +------------------------+  |
       v                         |
     +------------------------+  |
  +> | 5 Column (0, 0)        |  |
  |  +------------------------+  |
  |    v                         |
  |  +------------------------+  |
  |  | 6 Callback (1, 0)      |  |
  |  +------------------------+  |
  |    v                         |
  |  +------------------------+  |
  +- | 7 Next (0, 5)          |  |
     +------------------------+  |
       v                         |
     +------------------------+  |
     | 8 Close (0, 0)         | <+
     +------------------------+
       v
[...]