I am using sed for a simple substitution (see command syntax below). Everything works fine except that the last line of the input file does not get written to the output file. Has anyone ever seen this and know of way to force the last line to be written?

I don't know if it's playing a part in this or not, but, each input line can be up to 1600 characters long. All of the lines in the file, with the exception of the last one, are output regardless of whether a substitution was needed or done, which is the expected result.

Command(s) used
-----------------
sed 's/:60/:00/g' < inputfile > outputfile
or
sed '1,$ s/:60/:00/g' < inputfile > outputfile

My guess: last character of file is not a newline character. sed operates on lines not strings and lines must end with a newline character.

BINGO! I did a hex dump of the file and found that all of the records except the last one have a linefeed.

Any ideas on how to get a linefeed on this last record prior to running the sed command?

echo >> datafile