Linux-Environment

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This section collects info about common Linux shell environment variables. As a first step it is crowded by the variables found scanning the busybox and bash executables as well as the uClibc, glibc and musl libraries of each Firmware for all possible variables found in their source code. Some variables also appear in AVM-Environment and in CGI-Environment, which are in fact all the same, but at different positions and with different inheritance so they get own articles, and are cross referenced in the name collision header of each affected article. See also GNU Bash-Variables and variables.

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Linux-Environment

Daily updated index of all Linux shell variables found during firmware scans. Last update: 2020-03-30 03:56 GMT.
The label (linenv) in the Variable column shows there are other objects in this wiki using this name.
The Mod column shows the amount of models using the respective variable. If empty this is an orphan from older firmware.

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Variable	Mod	Description	Type	Origin
ACTION	2	The action to perform for mdev.	Text	busybox
auto_resume	2	Controls how the shell interacts with the user and job control.	Text	bash
BASH	2	The full pathname used to execute the current instance of Bash.	Text	bash
BASHOPTS	2	Colon-separated list of enabled shell options maintained by shopt.	Text	bash
BASHPID	2	Expands to the process ID of the current Bash process.	Text	bash
BASH_ALIASES	2	An associative array of aliases as maintained by alias.	Text	bash
BASH_ARGC	2	An array of the number of parameters in each frame of the bash stack.	Text	bash
BASH_ARGV	2	An array of the parameters in each frame of the bash stack.	Text	bash
BASH_CMDS	2	An array of the builtin Bash-Commands.	Text	bash
BASH_COMMAND	2	The command currently being executed.	Text	bash
BASH_COMPAT	2	The value to set the shell's compatibility level.	Text	bash
BASH_ENV	2	The path where Bash startup scripts are located.	Text	bash
BASH_EXECUTION_STRING	2	The command argument to the 'bash -c' invocation option.	Text	bash
BASH_LINENO	2	An array of line numbers in source files.	Text	bash
BASH_LOADABLES_PATH	2	Array of directories to search for loadable builtins maintained by enable.	Text	bash
BASH_REMATCH	2	An array assigned by the '=~' binary operator to the '[[' conditional command.	Text	bash
BASH_SOURCE	2	An array of source filenames of functions named in FUNCNAME.	Text	bash
BASH_SUBSHELL	2	Bash nesting depth. 0 = not a subshell.	Text	bash
BASH_VERSINFO	2	Readonly array of version informations for this instance of Bash.	Text	bash
BASH_VERSION	2	The version number of the current instance of Bash.	Text	bash
BASH_XTRACEFD	16	File descriptor number for trace output.	Text	busybox, bash
CDPATH	134	The search path for the cd command.	Text	busybox, bash
CHILD_MAX	2	Set the number of exited child status values for the shell.	Text	bash
COLUMNS	132	The number of characters per line on the console window.	Text	busybox, bash
COMPREPLY	2	An array of possible completions generated by the programmable completion facility.	Text	bash
COMP_CWORD	2	An index into COMP_WORDS of the word containing the current cursor position.	Text	bash
COMP_KEY	2	The key used to invoke the current completion function.	Text	bash
COMP_LINE	2	The current command line.	Text	bash
COMP_POINT	2	The index of the cursor position relative to the beginning of the current command.	Text	bash
COMP_TYPE	2	Set to an integer value corresponding to the type of completion attempt.	Text	bash
COMP_WORDBREAKS	2	Characters that Readline treats as word separators when performing word completion.	Text	bash
COMP_WORDS	2	An array of the individual words in the current command line.	Text	bash
CONSOLE	134	The console tty used by this Shell.	Text	busybox
console (linenv)	112	The console tty used by this Shell.	Text	busybox
COPROC	2	An array of file descriptors for I/O of an unnamed coprocess.	Text	bash
DEVPATH	2	The sysfs device path for mdev.	Text	busybox
DIRSTACK	2	An array of the current contents of the directory stack.	Text	bash
EMACS	1	Set if bash is running in an Emacs shell buffer to disable line editing.	Text	bash
ENV	134	Path to a profile script for ash.	Text	busybox
EUID	2	The numeric effective user id of the current user.	Text	bash
EXECIGNORE	2	Patterns of filenames to be ignored by command search using PATH.	Text	bash
EXINIT	103	Variable to customize vi.	Text	busybox
FIGNORE	2	Suffixes to ignore when performing filename completion.	Text	bash
FILENAME	77	Delivery filename for busybox popmaildir connect helper program.	Text	busybox
FIRMWARE	2	The firmware to load for mdev.	Text	busybox
FUNCNAME	2	Array of names of all shell functions currently in the execution call stack.	Text	bash
FUNCNEST	2	The maximum function nesting level. 0 = no limit.	Text	bash
GETCONF_DIR	2	Optional directory where getconf is located to query system variables.	Text	glibc
GETOPT_COMPATIBLE	79	Compatiblity tweak for getopt.	Text	busybox
GID	77	The group id of the user who owns this Shell.	Text	busybox
GLOBIGNORE	2	Patterns defining the set of filenames to be ignored by filename expansion.	Text	bash
GROUPS	2	An array of groups of which the current user is a member.	Text	bash
histchars	2	Up to 3 chars which control history expansion, quick substitution, and tokenization.	Text	bash
HISTCMD	2	The history number, or index in the history list, of the current command.	Text	bash
HISTCONTROL	2	List of values controlling how commands are saved on the history list.	Text	bash
HISTFILE	2	The name of the file to which the command history is saved.	Text	bash
HISTFILESIZE	2	The maximum number of lines contained in the history file.	Text	bash
HISTIGNORE	2	List of patterns masking command lines which should be saved on the history list.	Text	bash
HISTSIZE	2	The maximum number of commands to remember on the history list.	Text	bash
HISTTIMEFORMAT	2	Optional format string for the time displayed by the history builtin.	Text	bash
HOME (linenv)	134	The home directory of this Shell.	Text	busybox, uClibc, bash, glibc
HOSTFILE	2	A file in the same format as '/etc/hosts' for hostname completion.	Text	bash
HOSTNAME	48	The hostname of this machine.	Text	busybox, bash
hostname_completion_file	2	Old name of the HOSTFILE variable.	Text	bash
HOSTTYPE	2	A string describing the machine Bash is running on.	Text	bash
IFS	134	The character used as the internal field separator.	Text	busybox, bash, glibc
IGNOREEOF	2	Controls the action of the shell on receipt of an 'EOF' character.	Text	bash
ignoreeof	2	Controls the action of the shell on receipt of an 'EOF' character.	Text	bash
INSIDE_EMACS	2	Emacs 'version,comint' if bash is running inside an Emacs subshell.	Text	bash
LANG	103	The language of this Shell to select the Locale.	Text	uClibc, busybox, bash, glibc, musl
LC_ALL	103	Forced Locale of this Shell for applications.	Text	uClibc, busybox, bash, glibc, musl
LC_COLLATE	2	The collation order used when sorting the results of filename expansion.	Text	bash
LC_CTYPE	18	The character set used to display and input text.	Text	busybox, bash, glibc, musl
LC_MESSAGES	2	The Locale used to translate double-quoted strings preceded by a '$'.	Text	bash
LC_NUMERIC	2	The Locale used for number formatting.	Text	bash
LC_TIME	2	The Locale used for date and time formatting.	Text	bash
LD_BIND_NOW	9	Causes the dynamic linker to resolve all symbols at program startup.	Text	uClibc
LD_LIBRARY_PATH	1	List of directories to search for Shared-Libraries before the standard locations.	Text	musl
LD_PRELOAD	1	List of objects which should be preloaded by the dynamic linker.	Text	musl
LINES	103	The number of text lines on the console window.	Text	busybox, bash
LOGNAME	134	Similar to USER, some programs prefer to read this variable.	Text	busybox, uClibc, musl
MACHTYPE	2	Describes the system type on which Bash is executing, in the standard GNU format.	Text	bash
MAIL	2	Optional filename or directory name to poll for mail.	Text	bash
MAILCHECK	2	How often (in seconds) that the shell should check for mail.	Text	bash
MAILPATH	2	A list of filenames which the shell periodically checks for new mail.	Text	bash
MAPFILE	2	An array to hold the text read by the mapfile builtin.	Text	bash
offset	53	Offset of a busybox ntpd sync.	Text	busybox
OLDPWD (linenv)	134	The previous working directory of this Shell.	Text	busybox, bash
OPTARG	79	The value of the last option argument processed by the getopts builtin.	Text	busybox, bash
OPTERR	16	1= Display error messages generated by builtin getopts.	Text	busybox, bash
OPTIND	79	The index of the last option argument processed by the getopts builtin.	Text	busybox, bash
OSTYPE	2	A string describing the operating system Bash is running on.	Text	bash
PATH (linenv)	132	The path to search for commands of this Shell.	Text	busybox, uClibc, glibc
PIPESTATUS	2	An array of exit status values from most recent foreground pipeline.	Text	bash
POSIXLY_CORRECT	134	If present: Try to behave according to the POSIX standard.	Text	uClibc, busybox, bash, glibc
POSIX_PEDANTIC	2	If present: Try to behave according to the POSIX standard.	Text	bash
PPID	114	The process ID of the shell's parent process.	Text	busybox, bash
PROMPT_COMMAND	2	Optional command to execute before the printing of each primary prompt (PS1).	Text	bash
PROMPT_DIRTRIM	2	Optional number of directory components when expanding the 'w' and 'W' prompt string escapes	Text	bash
PS0	2	Prompt for interactive shells printed between reading and executing a command.	Text	bash
PS1	2	The primary prompt string.	Text	bash
PS2	2	The secondary prompt string.	Text	bash
PS3	2	Optional prompt for the select command.	Text	bash
PS4	2	The prompt printed before the command line is echoed when the '-x' option is set.	Text	bash
PWD (linenv)	132	The current working directory of this Shell.	Text	busybox, uClibc, glibc, musl
RANDOM	2	Generates a random integer (0 - 32767) each time this parameter is referenced.	Text	bash
READLINE_LINE	2	The contents of the Readline line buffer, for use with 'bind -x'.	Text	bash
READLINE_POINT	2	The position of the insertion point in the Readline line buffer, for use with 'bind -x'.	Text	bash
REPLY	79	The default variable for the read builtin.	Text	busybox
RUNLEVEL	103	The current system runlevel.	Text	busybox
SECONDS	2	The number of seconds since the shell was started.	Text	bash
SEQNUM	2	The sequence number for mdev.	Text	busybox
SHELL (linenv)	132	The absolute path of this Shell.	Text	busybox
SHELLOPTS	2	A colon-separated list of enabled shell options maintained by the set builtin.	Text	bash
SHLVL (linenv)	53	The number of shell levels running above this Shell.	Text	busybox, bash
SUBSYSTEM	2	The sybsystem to use for mdev.	Text	busybox
SVDIR	2	Overrides the services directory /var/service (for sv/runsv).	Text	busybox
SVWAIT	2	Overrides the 7s to wait for a command to run (for sv/runsv).	Text	busybox
TERM (linenv)	134	The terminal emulation used by this Shell.	Text	busybox
TERMCAP	2	Termcap description, set by a terminal emulator to provide the terminal's characteristics.	Text	bash
TEXTDOMAIN	2	The name of the current Locale.	Text	bash
TEXTDOMAINDIR	2	The absolute pathname of the directory storing Locales.	Text	bash
TIME	16	Optional default format for busybox time (-v,-p,-f override this).	Text	busybox
TMOUT	2	Optional default timeout for the read builtin. 0 = no timeout.	Text	bash
TMPDIR	6	Optional path where temporary files for the Shell are created.	Text	busybox, bash, glibc
TZ (linenv)	23	The time zone used by this Shell.	Text	busybox, bash
UID	77	The unique id of the user who owns this Shell.	Text	busybox
USER (linenv)	132	The user who owns this Shell.	Text	busybox
128 Linux variables

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