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fstab (after file systems table) is a system file commonly found in the directory /etc on Unix and Unix-like computer systems. In Linux, it is part of the util-linux package. The fstab file typically lists all available disk partitions and other types of file systems and data sources that may not necessarily be disk-based, and indicates how they are to be initialized or otherwise integrated ...
Display all active high-resolution timers and clock sources. q ' a: q: Switch the keyboard from raw mode, used by programs such as X11 and SVGAlib, to XLATE mode r: p: r: p: Sync all mounted filesystems s: o: s: r: Output a list of current tasks and their information to the console t: y: t: g: Remount all mounted filesystems in read-only mode u ...
This file lists all currently mounted filesystems along with their initialization options. mtab has a lot in common with fstab, the distinction being that the latter is a configuration file listing which available filesystems should be mounted on which mount points at boot time, whereas the former lists currently mounted ones, which can include manually mounted ones not listed in fstab.
Single-user mode, all filesystems unmounted but not root, all processes except console processes killed 2: Multi-user mode 3: Multi-user mode with RFS (and NFS in Release 4) filesystems exported 4: Multi-user, User-definable 5: Go to firmware 6: Reboot s, S: Identical to 1, except current terminal acts as the system console
The main mechanics of OverlayFS relate to the merging of directory access when both filesystems present a directory for the same name. Otherwise, OverlayFS presents the object, if any, yielded by one or the other, with the "upper" filesystem taking precedence.
Although 'fstab' and 'mount' are typically used to mount filesystems, they are also capable of mounting hardlinks. For instance, using 'mount' it's possible to create a mountpoint that points to the same inode as a file|directory on the system.
The filesystem appears as one rooted tree of directories. [1] Instead of addressing separate volumes such as disk partitions, removable media, and network shares as separate trees (as done in DOS and Windows: each drive has a drive letter that denotes the root of its file system tree), such volumes can be mounted on a directory, causing the volume's file system tree to appear as that directory ...
fsck first appeared in the Bell Labs "V7 addendum tape" of 1980. [8] [9] It turned into its modern wrapper form in NetBSD 1.3 (1998). fsck is not defined by any extant standard, [2] but the primitive non-wrapper form is present in the 1995 draft Systems Management: File System and Scheduling Utilities (FSSU) from X/Open.