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NAMElibstdbuf —
preloaded library to change standard streams initial
buffering
DESCRIPTIONThelibstdbuf library is meant to be preloaded with the
LD_PRELOAD environment variable to as to change the
initial buffering of standard input, standard output and standard error
streams.
Although you may load and configure this library manually, an utility, stdbuf(1), can be used to run a command with the appropriate environment variables. ENVIRONMENTEach stream can be configured independently through the following environment variables (values are defined below):Each variable may take one of the following values:
EXAMPLEIn the following example, the stdout stream of the awk(1) command will be fully buffered by default because it does not refer to a terminal.libstdbuf is used to force it to be
line-buffered so
vmstat(8)'s
output will not stall until the full buffer fills.
# vmstat 1 | LD_PRELOAD=/usr/lib/libstdbuf.so \ STDBUF_1=L awk '$2 > 1 || $3 > 1' | cat -n See also the manpage of stdbuf(1) for a simpler way to do this. HISTORYThelibstdbuf library first appeared in
FreeBSD 8.4.
AUTHORSThe original idea of thelibstdbuf command comes from
Padraig Brady who implemented it in the GNU coreutils.
Jeremie Le Hen implemented it on
FreeBSD.
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