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df (abbreviation for disk free) is a standard Unix command used to display the amount of available disk space for file systems on which the invoking user has appropriate read access. df is typically implemented using the statfs or statvfs system calls .
free — Display the total, free and used amount of physical memory and swap space. freeramdisk — Free all memory allocated to specified ramdisk. fsfreeze — Freeze or unfreeze a filesystem. fstype — Print type of filesystem on a block device or image. fsync — Synchronize a file's in-core state with storage device.
du (abbreviated from disk usage) is a standard Unix program used to estimate file space usage—space used under a particular directory or files on a file system. A Windows commandline version of this program is part of Sysinternals suite by Mark Russinovich .
The system utility fsck (file system check) is a tool for checking the consistency of a file system in Unix and Unix-like operating systems, such as Linux, macOS, and FreeBSD. [1] The equivalent programs on MS-DOS and Microsoft Windows are CHKDSK, SFC, and SCANDISK.
The support for TRIM also varies by what the particular filesystem driver on the operating system is capable of, since only a program with an understanding of what parts of the disk are free space can safely issue the command, and on the system level this ability tends to lie in the filesystem driver itself.
It is free for all uses, but donations are suggested. [2] No source code is available. Notable features include: A treemap represents how disk capacity is allocated. [4] Filters (based on file name, age, size, etc.) enable the user to focus the visualisation on files and folders of interest. [4]
FUSE was merged into the mainstream Linux kernel tree in kernel version 2.6.14. [8] The userspace side of FUSE, the libfuse library, generally followed the pace of Linux kernel development while maintaining "best effort" compatibility with BSD descendants. This is possible because the kernel FUSE reports its own "feature levels", or versions.
On Windows NT operating systems, CHKDSK can also check the disk surface for bad sectors and mark them (in MS-DOS 6.x and Windows 9x, this is a task done by Microsoft ScanDisk). The Windows Server version of CHKDSK is RAID-aware and can fully recover data in bad sectors of a disk in a RAID-1 or RAID-5 array if other disks in the set are intact. [11]