sed command - apply in all text (.txt) files of folder

Question

I want to apply this sed command

sed \'/begin 644/,$d\' file1.txt > file1.txt

to all files of the directory.. basically I want to keep the h

Answer 1

You can use this find with sed:

find . -maxdepth 1 -name '*.txt' -exec sed -i.bak '/begin 644/,$d' {} + 

Or if you want to keep begin 644:

find . -maxdepth 1 -name '*.txt' -exec sed -i.bak -n '1,/begin 644/p' {} +