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stdbuf

Run a command with modified buffering operations for its standard streams. More information: https://www.gnu.org/software/coreutils/stdbuf.

Change stdin buffer size to 512 KiB:

stdbuf --input={{512K}} {{command}}

Change stdout buffer to line-buffered:

stdbuf --output={{L}} {{command}}

Change stderr buffer to unbuffered:

stdbuf --error={{0}} {{command}}