refspecs.linuxfoundation.org/FHS_3.0/fhs.html
© 2015 the linux foundation

		FILESYSTEM HIERARCHY STANDARD

	this standard consists of a set of requirements and guidelines for file and
	directory placement under unix-like operating systems. the guidelines are
	intended to support interoperability of applications, system administration
	tools, development tools, and scripts as well as greater uniformity of
	documentation for these systems.

		/bin    essential command binaries
		/boot   static files of the boot loader
		/dev    device files
		/etc    host-specific system configuration
		/lib    essential shared libraries and kernel modules
		/media  mount point for removable media
		/mnt    mount point for mounting a filesystem temporarily
		/opt    add-on application software packages
		/run    data relevant to running processes
		/sbin   essential system binaries
		/srv    data for services provided by this system
		/tmp    temporary files
		/usr    secondary hierarchy
		/var    variable data

		§ 7.2. BACKGROUND
	the process of developing a standard filesystem hierarchy began in august 1993
	with an effort to restructure the file and directory structure of linux. the
	fsstnd, a filesystem hierarchy standard specific to the linux operating system,
	was released on february 14, 1994. subsequent revisions were released on october
	9, 1994 and march 28, 1995.

		NOTE: directories (e.g. /var) contain sub-hierarchies "also lass mich mal was
		      abwickeln": /var/spool

specifications.freedesktop.org/basedir-spec/latest/
© 2024 freedesktop.org

		XDG BASE DIRECTORY SPECIFICATION

	various specifications specify files and file formats. this specification
	defines where these files should be looked for by defining one or more base
	directories relative to which files should be located. 

		$XDG_DATA_HOME          data files
		$XDG_CONFIG_HOME        configuration files
		$XDG_STATE_HOME         state data
		$XDG_CACHE_HOME         non-essential (cached) data
		$XDG_RUNTIME_DIR        runtime files and other file objects*
		IFS=: $XDG_DATA_DIRS    data
		IFS=: $XDG_CONFIG_DIRS  configuration
		?                       executable files

cpli.dev/htc.txt
@ 2025/01/24 me

		HOME TREE CONVENTION

	peculiarities which describe my home directory. these conventions are subject
	changes by whimsy.

		~/bin  SYS_BIN=/usr/bin    XDG_BIN_HOME="$SYS_BIN"/_
		~/res  SYS_RES=/usr/share  XDG_DATA_HOME="$SYS_RES"/_
		~/var  SYS_VAR=/var/lib    XDG_STATE_HOME="$SYS_VAR"/_
		~/tmp  SYS_TMP=/var/cache  XDG_CACHE_HOME="$SYS_TMP"/_
		~/cfg  SYS_CFG=/etc        XDG_CONFIG_HOME="$SYS_CFG"/_

	fhs^ states "there must be no subdirectories in /bin"