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By default, the Single UNIX Specification (SUS) specifies that du is to display the file space allocated to each file and directory contained in the current directory. Links will be displayed as the size of the link file, not what is being linked to; the size of the content of directories is displayed, as expected.
The table below shows the default file system, but many Linux distributions support some or all of ext2, ext3, ext4, Btrfs, ReiserFS, Reiser4, JFS, XFS, GFS2, OCFS2, and NILFS. It is possible to install Linux onto most of these file systems. The ext file systems, namely ext2, ext3, and ext4 are based on the original Linux file system.
Returns information of a file or directory if specified, else information of the current working directory is returned. LPRT RFC 1639 Specifies a long address and port to which the server should connect. LPSV RFC 1639 Enter long passive mode. MDTM RFC 3659 Return the last-modified time of a specified file. MFCT
ext4 (fourth extended filesystem) is a journaling file system for Linux, developed as the successor to ext3.. ext4 was initially a series of backward-compatible extensions to ext3, many of them originally developed by Cluster File Systems for the Lustre file system between 2003 and 2006, meant to extend storage limits and add other performance improvements. [4]
When a file is relocated to a different directory on the same file system, or when a disk defragmentation alters its physical location, the file's inode number remains unchanged. This unique characteristic permits the file to be moved or renamed even during read or write operations, thereby ensuring continuous access without disruptions.
It was created by Chris Mason in 2007 [15] for use in Linux, and since November 2013, the file system's on-disk format has been declared stable in the Linux kernel. [ 16 ] Btrfs is intended to address the lack of pooling , snapshots , checksums , and integral multi-device spanning in Linux file systems . [ 9 ]
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On Linux and modern BSD derivatives, this directory has subdirectories such as man for manpages, that used to appear directly under /usr in older versions. /var: Stands for variable. A place for files that might change frequently - especially in size, for example e-mail sent to users on the system, or process-ID lock files. /var/log