Btrfs-check manual page and help. The file system checker is used to check the structural integrity of the file system and to attempt to repair it upon request. It is recommended to disconnect the file system before running the scan, but it is also possible to scan the mounted file system (see --force).
Linux btrfs-balance manual page and help. The primary purpose of the balance function is to distribute block groups across all devices to meet the constraints set by the applicable profiles. For more details, see mkfs.btrfs (8) PROFILES. The scope of the balancing process can be further filtered using filters that can select the block groups to be processed. Balance only works on a mounted file system.
Manual page and help for the ln linux command. If the last argument is an existing directory, ln creates a binding to all other specified files in that directory (with the same name). If only one file is specified, it creates a bind to the current directory. Otherwise, if two files are specified, it creates a binding to the first with the name specified by the second. It is an error if the last argument is not a directory and more than two files are given.
The manual page and help for the head linux command. This manual page covers the GNU version of head. The head prints the first part of the specified files (by default the first 10 lines). If no filename is specified or filename '-', its input will be taken from standard input. If more than one file is specified, the file names are `==> 'and`Prints <== 'before the first part of each file.