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I want to delete the same files in two directories. Both have so many files with the same name. If two files are same I want to delete in the first directory. I am not sure whether linux shell is better choice or python would be better.

  1. $HOME/bin
  2. $HOME/cin

In some search, there is an close answer for comparison.

find cin -type f -exec cmp '{}' "bin/{}" \;

But this is not working because the first output of find, {} contains "cin/" directory name such as "cin/file1". So the second "bin/{}" has "bin/cin/file1". Then comparison error occurs 

cmp: bin/cin/file1: No such file or directory

how to compare cin/file1 and bin/file1?

hradecek
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Joonho Park
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1 Answers1

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You can use this find command:

find cin -type f -exec bash -c 'f="${1#cin/}"; cmp "cin/$f" "bin/$f"' _ {} \;

It executes the command inside bash -c for all regular files in cin directory.

The upper directory is removed by the bashism ${1#...} and the variable f is set to relative path.

oliv
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  • Would you explain some more about bashism or refer to more webpage? and what is the role of underbar, '_'? – Joonho Park Jun 21 '18 at 07:33
  • You can look at `man --pager='less -p \\${parameter#' bash` for your first question and [this link](https://stackoverflow.com/questions/38866883/how-to-use-positional-parameters-with-bash-c-command) for your second one. – oliv Jun 21 '18 at 07:53