STDBUF(1) STDBUF(1) stdbuf - COMMAND . stdbuf OPTION... COMMAND COMMAND . . -i, --input=MODE -o, --output=MODE -e, --error=MODE --help --version MODE 'L' . . MODE '0' . MODE : KB 1000, K 1024, MB 1000*1000, M 1024*1024, G,T,P,E,Z,Y,R,Q. : KiB=K, MiB=M, . MODE . : COMMAND ( 'tee' ) 'stdbuf'. ( 'dd' 'cat' .) / 'stdbuf'. : 125 stdbuf 126 COMMAND 127 COMMAND - COMMAND tail -f access.log | stdbuf -oL cut -d ' ' -f1 | uniq access.log GLIBC . Padraig Brady. : bug-coreutils@gnu.org GNU coreutils : : (C) 2026 (Free Software Foundation, Inc.). GPLv3+: GNU GPL 3 . . : . . : info '(coreutils) stdbuf invocation' 3 . . : . GNU coreutils 9.11 2026 STDBUF(1)