I fed everything after the 'echo' to the TECO I have running on my
machine and all it said was:
? Invalid insert arg
I have the TECO from Eric Raymond's Retrocomputing archive, locally
modified to be 8-bit clean so I can copy files with
*erinput-name$ewoutput-name$$
I keep a statically linked copy in /sbin for emergency editing and
system recovery.
If anyone's interested I can put my 8-bit clean TECO up for FTP.