Translate line-printer control sequences to newlines/form feeds (POSIX)
The asa utility writes its input files to standard output, mapping carriage control characters from the files to line-printer control sequences. If you specify - for a file name, asa reads from standard input.
All characters in column position 1 are removed from the input, and the following actions are performed, depending on the character:
Any other character in column 1 is left unchanged.