Aliases: zero(4), zero(4), zero(4), zero(4), zero(4), zero(4), zero(4), zero(4), zero(4), zero(4), zero(4), zero(4), zero(4), zero(4), zero(4)
null, zero - data sink
Data 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 (\(aq\0\(aq 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
If 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.)
This page is part of release 5.00 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.