unix console: how to delete lines that contained in other lines -

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i have text file contains sorted paths e.g.

/abc /abc/def /abc/jkl /def /def/jkl /def/jkl/yui /def/xsd /zde

now i'd delete lines contained in other lines in case following lines should stay:

/abc/def /abc/jkl /def/jkl/yui /def/xsd /zde

using awk , tac (concatenate , print files in reverse):

$ tac test.txt | awk '{ if (substr(prev, 1, length($0)) != $0) print $0; prev = $0}' | tac /abc/def /abc/jkl /def/jkl/yui /def/xsd /zde

here's more readable version of awk:

{     if (substr(prev, 1, length($0)) != $0)  # compare last line (substring?)         print $0;     prev = $0  # remember last line }

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