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Inserting the filename before the first line of a text file

I'm trying to add the filename of a text file into the first line of a the same text file. for example if the file name is called test1.txt, then the first line when you open the file should be test1.

below is what I've done so for, the only problem i have is that the word "$file" is being written to the file not the file name. any help is appreciated.

for file in *.txt; do
sed -i '1 i\$file' $file;
awk 'sub("$", "\r")' "$file" >  "$file"1;
mv "$file"1 "$file";
done
Solution

  • Without concise, testable sample input and expected output it's an untested guess but it SOUNDS like all you need is:

    awk -i inplace -v ORS='\r\n' 'FNR==1{print FILENAME}1' *

    No shell loop or multiple commands required.

    The above uses GNU awk for inplace editing and I'm assuming the sub() in your code was intended to add a \r at the end of every line.