Originally Posted by el848484
$ md5sum -c * ../PMmd5
md5sum: file1: no properly formatted MD5 checksum lines found
md5sum: file2: no properly formatted MD5 checksum lines found
You are using the wrong command syntax, it should be:
The misplaced * in your command will expand the files present in the directory and these are expected to be files holding md5sum info (the -c switch) by md5sum. That's where the error/warning is coming from.