Usage: stdbuf OPTION... COMMAND
Run COMMAND, with modified buffering operations for its standard streams.

Mandatory arguments to long options are mandatory for short options too.
  -i, --input=MODE   Adjust standard input stream buffering
  -o, --output=MODE  Adjust standard output stream buffering
  -e, --error=MODE   Adjust standard error stream buffering
      --help     display this help and exit
      --version  output version information and exit

If MODE is `L' then corresponding stream will be line buffered.
This option is invalid with standard input.

If MODE is `0' then corresponding stream will be unbuffered.

Otherwise MODE is a number which may be followed by one of the following:
KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.
In this case the corresponding stream will be fully buffered with the buffer
size set to MODE bytes.

NOTE: If COMMAND adjusts the buffering of its standard streams (`tee' does
for e.g.) then that will override corresponding settings changed by `stdbuf'.
Also some filters (like `dd' and `cat' etc.) don't use streams for I/O,
and are thus unaffected by `stdbuf' settings.

Report stdbuf bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>