btrfs - a toolbox to manage btrfs filesystems
btrfs <command> [<args>]
The btrfs utility is a toolbox for managing btrfs filesystems. There are command groups to work with subvolumes, devices, for whole filesystem or other specific actions. See section COMMANDS. There are also standalone tools for some tasks like btrfs-convert or btrfstune that were separate historically and/or haven't been merged to the main utility. See section STANDALONE TOOLS for more details. For other topics (mount options, etc) please refer to the separate manual page btrfs(5).
Any command name can be shortened as far as it stays unambiguous, however it is recommended to use full command names in scripts. All command groups have their manual page named btrfs-<group>. For example: it is possible to run btrfs sub snaps instead of btrfs subvolume snapshot. But btrfs file s is not allowed, because file s may be interpreted both as filesystem show and as filesystem sync. If the command name is ambiguous, the list of conflicting options is printed. For an overview of a given command use btrfs command --help or btrfs [command...] --help --full to print all available options.
balance Balance btrfs filesystem chunks across single or several devices. See btrfs-balance(8) for details. check Do off-line check on a btrfs filesystem. See btrfs-check(8) for details. device Manage devices managed by btrfs, including add/delete/scan and so on. See btrfs-device(8) for details. filesystem Manage a btrfs filesystem, including label setting/sync and so on. See btrfs-filesystem(8) for details. inspect-internal Debug tools for developers/hackers. See btrfs-inspect-internal(8) for details. property Get/set a property from/to a btrfs object. See btrfs-property(8) for details. qgroup Manage quota group(qgroup) for btrfs filesystem. See btrfs-qgroup(8) for details. quota Manage quota on btrfs filesystem like enabling/rescan and etc. See btrfs-quota(8) and btrfs-qgroup(8) for details. receive Receive subvolume data from stdin/file for restore and etc. See btrfs-receive(8) for details. replace Replace btrfs devices. See btrfs-replace(8) for details. rescue Try to rescue damaged btrfs filesystem. See btrfs-rescue(8) for details. restore Try to restore files from a damaged btrfs filesystem. See btrfs-restore(8) for details. scrub Scrub a btrfs filesystem. See btrfs-scrub(8) for details. send Send subvolume data to stdout/file for backup and etc. See btrfs-send(8) for details. subvolume Create/delete/list/manage btrfs subvolume. See btrfs-subvolume(8) for details.
There are several standalone tools to provide certain functionality. If the functionality proves to be useful, the standalone tools are declared obsolete and their functionality copied to the main tool. The deprecation period is long (years) and the obsolete binaries are still provided. Tools that are still in active use without an equivalent in btrfs: btrfs-convert in-place conversion from ext2/3/4 filesystems to btrfs btrfstune tweak some filesystem properties on a unmounted filesystem btrfs-select-super rescue tool to overwrite primary superblock from a spare copy btrfs-find-root rescue helper to find tree roots in a filesystem Deprecated and obsolete tools: btrfs-debug-tree moved to btrfs inspect-internal dump-tree btrfs-show-super moved to btrfs inspect-internal dump-super btrfs-zero-log moved to btrfs rescue zero-log
btrfs returns a zero exit status if it succeeds. Non zero is returned in case of failure.
btrfs is part of btrfs-progs. Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for further details.
btrfs-balance(8), btrfs-check(8), btrfs-convert(8), btrfs-device(8), btrfs-filesystem(8), btrfs-inspect-internal(8), btrfs-property(8), btrfs-qgroup(8), btrfs-quota(8), btrfs-receive(8), btrfs-replace(8), btrfs-rescue(8), btrfs-restore(8), btrfs-scrub(8), btrfs-send(8), btrfs-subvolume(8), btrfstune(8), mkfs.btrfs(8)
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.