null - Online Linux Manual PageSection : 4
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEnull, zero − data sink

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DESCRIPTIONData written to the /dev/null and /dev/zero special files is discarded. Reads from /dev/null always return end of file (i.e., read(2) returns 0), whereas reads from /dev/zero always return bytes containing zero ('\0' characters). These devices are typically created by: mknod −m 666 /dev/null c 1 3 mknod −m 666 /dev/zero c 1 5 chown root:root /dev/null /dev/zero

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FILES/dev/null
/dev/zero

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NOTESIf these devices are not writable and readable for all users, many programs will act strangely. Since Linux 2.6.31, reads from /dev/zero are interruptible by signals. (This change was made to help with bad latencies for large reads from /dev/zero.)

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SEE ALSOchown(1), mknod(1), full(4) 0

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