formatted output cannot be piped

[yberreby]

bmon -o format > file.txt creates an empty file. It is not possible to pipe the output of the program to a file (because of curses, I presume); I ran into this when trying to read the output of bmon from a parent process.

[tgraf]

I believe this has already been fixed. Curses used to be initialized for formatted output but this is no longer the case. What you describe works for me.

[yberreby]

I have version 3.6 on OS X, installed with homebrew. I'll try building from source.

[yberreby]

Still doesn't work with a fresh clone. Any idea why?

yohai@imac-5k ~/code/software/bmon$ bmon -o format
lo0 44484079 44484079 629458 629458
en0 248662754 38887010 296994 251607
en1 0 0 0 0
en2 0 0 0 0
en3 0 0 0 0
bridge0 0 342 0 1
^C
yohai@imac-5k ~/code/software/bmon$ bmon -o format > foo.txt
^C
yohai@imac-5k ~/code/software/bmon$ ls -lrt
total 984
drwxr-xr-x   3 yohai  staff     102 30 jui 12:05 m4
-rw-r--r--   1 yohai  staff    5402 30 jui 12:05 configure.ac
-rwxr-xr-x   1 yohai  staff      52 30 jui 12:05 autogen.sh
-rw-r--r--   1 yohai  staff    1587 30 jui 12:05 README.md
-rw-r--r--   1 yohai  staff     619 30 jui 12:05 NEWS
-rw-r--r--   1 yohai  staff     143 30 jui 12:05 Makefile.am
-rw-r--r--   1 yohai  staff    1023 30 jui 12:05 LICENSE.MIT
-rw-r--r--   1 yohai  staff    1192 30 jui 12:05 LICENSE.BSD
-rw-r--r--   1 yohai  staff       0 30 jui 12:05 ChangeLog
-rwxr-xr-x   1 yohai  staff  262681 30 jui 12:05 configure
-rw-r--r--   1 yohai  staff   49976 30 jui 12:05 aclocal.m4
drwxr-xr-x   8 yohai  staff     272 30 jui 12:05 build-aux
-rw-r--r--   1 yohai  staff   25532 30 jui 12:05 Makefile.in
drwxr-xr-x   6 yohai  staff     204 30 jui 12:05 man
drwxr-xr-x   6 yohai  staff     204 30 jui 12:05 include
drwxr-xr-x   6 yohai  staff     204 30 jui 12:05 examples
-rwxr-xr-x   1 yohai  staff   35180 30 jui 12:05 config.status
-rw-r--r--   1 yohai  staff   55532 30 jui 12:05 config.log
-rw-r--r--   1 yohai  staff   25779 30 jui 12:05 Makefile
drwxr-xr-x  52 yohai  staff    1768 30 jui 12:05 src
-rw-r--r--   1 yohai  staff       0 30 jui 12:07 foo.txt
yohai@imac-5k ~/code/software/bmon$

I'm running OS X 10.10.2 (Yosemite).

[tgraf]

This seems to be OS X specific then. Works fine on Linux:

[tgraf@lsx bmon]$ src/bmon -o format > l
^C
[tgraf@lsx bmon]$ wc -l l
262 l

Can you try the following?
bmon -o format:stderr 2> foo.txt

[yberreby]

bmon -o format:stderr 2> foo.txt produces a output file with the data, it works.

[tgraf]

This may be related to OS X buffering stdout which delays writing to stdout immediately. You may have to use unbuffer or stdbuf if you want to use stdout. Just a guess though.

[yberreby]

The problem was indeed caused by buffering - unbuffer solved it. Thanks!