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I want to use sed for extracting the file name after the last occurrence of /.

For example /usr/bin/file.txt and the output should be file.txt

  • Is this an assignment/homework? I can't see any other reason as to why you absolutely need to use sed. – Nasir Riley Nov 7 '18 at 0:50
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You don't need to use sed; you can use the basename command to return the filename part:

> basename /usr/bin/top
top 

If you definitely want to use sed, this works with GNU sed 4.5:

sed 's/^.*\/\([^/]\+\)$/\1/'
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    no need to anchor the .* to the beginning -- it's greedy and will match as much as it can; ditto the trailing part – Jeff Schaller Nov 7 '18 at 1:11

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