If you’ve ever had to deal with corrupt mbox files, in which some “From lines” were not separated from the preceding message by the required blank line, you might find this program useful. Fls (From line separator) will insert blank lines before “From lines” only where needed. The resulting mbox file is directed to stdout.
News
Version 1.0 — released on August 10, 2018 — includes the following improvements:
- Fixedthe last input line was duplicated in the output;
- NEWif no input file is specified, Fls will read from standard input;
- NEWexplanatory help text.
“Fls” is Copyright © Dario Niedermann —
Released with no warranty under the terms of the
GPLv3 license. Written and tested on Linux using GNU tools. 
