CmdID / Programs / Linux and Unix
stdbuf
Run a command with modified buffering operations for its standard streams. tldr-pages
GTFOBins shell 1 ATT&CK technique 1 documented command
How stdbuf is abused
shell T1059.004 Command and Scripting Interpreter: Unix Shell
-i0Each abuse is GTFOBins's category and the options and words it uses; the full write-up is on GTFOBins's page for stdbuf.
1 documented command
The command CmdID reads trips no Sigma process-creation rule. This command is from GTFOBins, at commit acd524623f9c of 2026-05-27, under the GPL-3.0, with no warranty. Changed: Markdown is shown formatted. The source is in lolbas-gtfobins-commands.json.gz, and the full entry is on GTFOBins’s page for stdbuf. CmdID reads the line that runs stdbuf.
What detects it
Everyday use
Change stdin buffer size to 512 KiB
stdbuf --input 512K commandIdentifyChange stdout buffer to line-buffered
stdbuf --output L commandIdentifyChange stderr buffer to unbuffered
stdbuf --error 0 commandIdentifyNone of the 3 examples CmdID reads matches GTFOBins abuse or trips a Sigma process-creation rule.