bup-newliner - make sure progress messages don't overlap with output
<any command> 2>&1 | bup newliner
bup newliner is run automatically by bup. You shouldn't need it unless
you're using it in some other program.
Progress messages emitted by bup (and some other tools) are of the form
"Message ### content\r", that is, a status message containing a
variable-length number, followed by a carriage return character and no
newline. If these messages are printed more than once, they overwrite each
other, so what the user sees is a single line with a continually-updating
This works fine until some other message is printed. For example, progress
messages are usually printed to stderr, but other program messages might be
printed to stdout. If those messages are shorter than the progress message
line, the screen will be left with weird looking artifacts as the two messages
get mixed together.
bup newliner prints extra space characters at the right time to make sure
that doesn't happen.
If you're running a program that has problems with these artifacts, you can
usually fix them by piping its stdout and
its stderr through bup
Part of the bup(1) suite.
Avery Pennarun <email@example.com>.