man > full(4)

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📖 NAME

full — always full device

🚀 Quick Reference

Use Case	Command	Description
Test disk‑full error handling	echo "test" > /dev/full	📝 Write fails with ENOSPC error
Create /dev/full device	mknod -m 666 /dev/full c 1 7	⚙️ Creates the device if missing
Set device ownership	chown root:root /dev/full	🔐 Sets proper owner and group
Read null bytes	cat /dev/full	🔢 Outputs \0 (null) characters indefinitely
Seek on device	lseek on /dev/full	📍 Seek operations always succeed

⚙️ CONFIGURATION

If your system does not have /dev/full created already, it can be created with the following commands:

mknod -m 666 /dev/full c 1 7
chown root:root /dev/full

📄 DESCRIPTION

The file /dev/full has major device number 1 and minor device number 7.

• ✍️ Writes to the /dev/full device fail with an ENOSPC error. This can be used to test how a program handles disk‑full errors.
• 📖 Reads from the /dev/full device will return \0 characters.
• 📍 Seeks on /dev/full will always succeed.

📁 FILES

• /dev/full

🔗 SEE ALSO

mknod(1), null(4), zero(4)

📜 COLOPHON

This page is part of release 5.10 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/.

📖 NAME 🚀 Quick Reference ⚙️ CONFIGURATION 📄 DESCRIPTION 📁 FILES 🔗 SEE ALSO 📜 COLOPHON