stdbuf

Run a command with modified buffering operations for its standard streams.

More information.

• Change the standard input buffer size to 512 KiB:

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

• Change the standard output buffer to line-buffered:

stdbuf --output={L} {command}

• Change the standard error buffer to unbuffered:

stdbuf --error={0} {command}

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