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Annotation of 42BSD/usr.lib/learn/editor/L20.01a, revision 1.1.1.1

1.1       root        1: #print
                      2: Now that you know how to delete lines,
                      3: you may eventually delete some by mistake.
                      4: If you just deleted some lines, you can always recover them
                      5: with the 'u' command.  For example,
                      6: 
                      7:   1,5d
                      8:   u
                      9: 
                     10: will delete the first 5 lines and then 'undo' that change.
                     11: 
                     12: I will put you in the editor with a file called 'colors'.
                     13: Print its contents, then delete the first 5 lines
                     14: and issue the 'undo' command.  Print the
                     15: file again to make sure that it's all there, rewrite the file,
                     16: quit, and type 'ready'.
                     17: #create Ref
                     18: red
                     19: yellow
                     20: blue
                     21: green
                     22: purple
                     23: brown
                     24: orange
                     25: #create colors
                     26: red
                     27: yellow
                     28: blue
                     29: green
                     30: purple
                     31: brown
                     32: orange
                     33: #copyin
                     34: #pipe
                     35: ex +'set prompt noopt open' colors
                     36: #user
                     37: #unpipe
                     38: #uncopyin
                     39: (diff Ref colors || grep 1,5d .copy) > /dev/null
                     40: #log
                     41: #next
                     42: 20.01b 10

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