Answer to chapter 5 question 7
Use ls with option -l, and pipe the
output to sort. Since the fifth field is the field
which is to be used for sorting comparisons, argument
+4 should be given to sort (the fields
are counted starting from 0). The sort should be according to
numerical order rather than lexical, so sort requires
option -n also:
ls -l | sort -n +4
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