如何递归查找特定文件并从linux中找到的所有文件中删除最后一行？

Question

I want to find a specific file eg foo.txt recursively and delete the last line from it if the line contains a specific word (eg bar) . Basically combine -

find . -type f -iname "foo.txt"
sed '$d' foo.txt

dir1 -
      |-sub-dir1-
                 |-foo.txt
      |-sub-dir2-
                 |-foo.txt
      |-
      .
      .
      |-
      |-sub-dirn-
                 |-foo.txt

Delete last line from all foo.txt files under dir1 if the last line contains bar .

Original contents -

foo.txt
1
2
bar

After deletion -

foo.txt
1
2

Thanks.

Answer 1

Use the -exec option to run the sed command. Add the /bar/ regular expression to check that the last line also matches that pattern.

find . -type f -iname "foo.txt" -exec sed -i '${/bar/d;}' {} +