Convert from EBCDIC to ASCII

dd if=InputFile of=OutputFile conv=ascii

The above command will convert EBCDIC InputFile to ASCII OutputFile. If you omit of=OutputFile, the output fill go to stdout.
If you want to use stdin, remove if=InputFile. Use control+D to terminate input.

I kept forgetting the dd command, hence this post, which it seems is versatile. It can be used to convert from lowercase or uppercase or convert only n bytes or blocks at a time. Further, I can combine the conversion keywords. e.g.

dd if=testE.dat conv=ebcdic,lcase