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Annotation of 42BSD/usr.lib/learn/editor/L35.2d, revision 1.1.1.1

1.1       root        1: #print
                      2: A useful operation is to replace a string of several blanks
                      3: by exactly one blank.  Note that you can't just write
                      4: 
                      5: s/ */ /
                      6: 
                      7: because the " *" willl match any number of blanks
                      8: including zero.  Thus it will always match at the beginning
                      9: of the line, even if there is no blank there.
                     10: The normal sequence is
                     11: 
                     12: s/  */ /
                     13: which will only substitute for a string
                     14: that has at least one blank in it.
                     15: Try that command on the line in the file "line".
                     16: Then rewrite the file "line" and type "ready".
                     17: #create Ref
                     18: here is a long space.
                     19: #create line
                     20: here      is a long space.
                     21: #user
                     22: #cmp line Ref
                     23: #log
                     24: #next
                     25: 35.2e 5

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