Question

So I am going to post a question about shell scripting again.

Problem Definition: For all files under a dir, ex.:

• A_anything.txt, B_anything.txt, ……

I want to execute a script, say ‘CMD’, on each of them, with the output files named like:

• A_result.txt, B_result.txt, ……

In addition, at the first line of these output file, I want to have the file name of the original one.

The ‘find -exec’ util seems to me unable to extract part of the file name.

Does someone know a solution to this problem, by any means(shell, python, find,etc)? Thank you!

Answer 1

cd /directory
for file in *.txt ; do
    newfilename=`echo "$file"|sed 's/\(.\+\)_.*/\1_result.txt/`
    echo "$file" > "$newfilename" 
    your-command $file >> "$newfilename"
done

HTH