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Annotation of 42BSD/usr.lib/learn/editor/L8.2a, revision 1.1.1.1

1.1       root        1: #print
                      2: You can give addresses involving simple arithmetic
                      3: to move around in the file.  For example, 
                      4:   3+1p
                      5: is the same as
                      6:   4p
                      7: in the editor.  Now that's not interesting, but
                      8: if the current line (".") is line 3, then
                      9:   .+1p
                     10: is also 4p; it prints the next line. For example,
                     11: you can print the 3rd and 4th lines of this file
                     12: using
                     13:    3p
                     14:    .+1p
                     15:    w
                     16:    q
                     17: where "3p" prints the third line, as usual,
                     18: and then ".+1p" prints the next or fourth line.
                     19: Try that.  Type "ready" when done.
                     20: #create Ref
                     21: :caslon
                     22: :century schoolbook
                     23: :"file" 8 lines, 86 characters
                     24: #create file
                     25: baskerville
                     26: bodoni
                     27: caslon
                     28: century schoolbook
                     29: futura
                     30: helvetica
                     31: news gothic
                     32: times roman
                     33: #copyout
                     34: #pipe
                     35: ex +'set prompt noopt open' file
                     36: #user
                     37: #unpipe
                     38: #uncopyout
                     39: tail -3 .ocopy >X1
                     40: #cmp Ref X1 3
                     41: #log
                     42: #next
                     43: 8.2b 5
                     44: 9.1a 10

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