Notes on Linux, Unix, BSD or Windows File Systems and Storage.
/dev/pts devptsPTY slave filesystem/dev/shm tmpfsPOSIX shared memory maintenance access
mount -t tmpfs -o size=10G,nr_inodes=10k,mode=0700 tmpfs /mytmpfs
| 1 char | Memory devices | Description |
|---|---|---|
| 1 = /dev/mem | Physical memory access | |
| 2 = /dev/kmem | Kernel virtual memory access | |
| 3 = /dev/null | Null device | |
| 4 = /dev/port | ||
| 5 = /dev/zero | Null byte source | |
| 6 = /dev/core | OBSOLETE - replaced by /proc/kcore | |
| 7 = /dev/full | Returns ENOSPC on write | |
| 8 = /dev/random | Nondeterministic random number gen. | |
| 9 = /dev/urandom | Faster, less secure random number gen. | |
| 10 = /dev/aio | Asyncronous I/O notification interface | |
| 11 = /dev/kmsg | Writes to this come out as printk's | |
| 1 block | RAM disk | |
| 0 = /dev/ram0 | First RAM disk | |
| 1 = /dev/ram1 | Second RAM disk | |
| 250 = /dev/initrd | Initial RAM disk (2.6) newer kernels use /dev/ram0 |
Refer to devices for a complete list.
Read more about tmpfs.
tmpfs /run/shm tmpfs nosuid,nodev,size=40%,mode=1777 0 0