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ENVIRONMENT

AFSUSER (+)
Equivalent to the afsuser shell variable.

COLUMNS
The number of columns in the terminal. See Terminal management.

DISPLAY
Used by X Window System (see X(1)). If set, the shell does not set autologout (q.v.).

EDITOR
The pathname to a default editor. See also the VISUAL environment variable and the run-fg-editor editor command.

GROUP (+)
Equivalent to the group shell variable.

HOME
Equivalent to the home shell variable.

HOST (+)
Initialized to the name of the machine on which the shell is running, as determined by the gethostname(2) system call.

HOSTTYPE (+)
Initialized to the type of machine on which the shell is running, as determined at compile time. This variable is obsolete and will be removed in a future version.

HPATH (+)
A colon-separated list of directories in which the run-help editor command looks for command documentation.

LANG
Gives the preferred character environment. See Native Language System support.

LC_CTYPE
If set, only ctype character handling is changed. See Native Language System support.

LINES
The number of lines in the terminal. See Terminal management.

LS_COLORS
The format of this variable is reminicent of the termcap(5) file format; a colon-separated list of expressions of the form "xx=string", where "xx" is a two-character variable name. The variables with their associated defaults are:

.nf no 0 Normal (non-filename) text fi 0 Regular file di 01;34 Directory ln 01;36 Symbolic link pi 33 Named pipe (FIFO) so 01;35 Socket bd 01;33 Block device cd 01;32 Character device ex 01;32 Executable file mi (none) Missing file (defaults to fi) or (none) Orphanned symbolic link (defaults to ln) lc ^[[ Left code rc m Right code ec (none) End code (replaces lc+no+rc) .fi

You only need to include the variables you want to change from the default.

File names can also be colorized based on filename extension. This is specified in the LS_COLORS variable using the syntax "*ext=string". For example, using ISO 6429 codes, to color all C-language source files blue you would specify "*.c=34". This would color all files ending in .c in blue (34) color.

Control characters can be written either in C-style-escaped notation, or in stty-like ^-notation. The C-style notation adds ^[ for Escape, \_ for a normal space characer, and ? for Delete. In addition, the ^[ escape character can be used to override the default interpretation of ^[, ^, : and =.

Each file will be written as <lc> <color-code> <rc> <filename> <ec>. If the <ec> code is undefined, the sequence <lc> <no> <rc> will be used instead. This is generally more convenient to use, but less general. The left, right and end codes are provided so you don't have to type common parts over and over again and to support weird terminals; you will generally not need to change them at all unless your terminal does not use ISO 6429 color sequences but a different system.

If your terminal does use ISO 6429 color codes, you can compose the type codes (i.e. all except the lc, rc, and ec codes) from numerical commands separated by semicolons. The most common commands are:

0
to restore default color

1
for brighter colors

4
for underlined text

5
for flashing text

30
for black foreground

31
for red foreground

32
for green foreground

33
for yellow (or brown) foreground

34
for blue foreground

35
for purple foreground

36
for cyan foreground

37
for white (or gray) foreground

40
for black background

41
for red background

42
for green background

43
for yellow (or brown) background

44
for blue background

45
for purple background

46
for cyan background

47
for white (or gray) background

Not all commands will work on all systems or display devices.

A few terminal programs do not recognize the default end code properly. If all text gets colorized after you do a directory listing, try changing the no and fi codes from 0 to the numerical codes for your standard fore- and background colors.

MACHTYPE (+)
The machine type (microprocessor class or machine model), as determined at compile time.

NOREBIND (+)
If set, printable characters are not rebound to self-insert-command. See Native Language System support.

OSTYPE (+)
The operating system, as determined at compile time.

PATH
A colon-separated list of directories in which to look for executables. Equivalent to the path shell variable, but in a different format.

PWD (+)
Equivalent to the cwd shell variable, but not synchronized to it; updated only after an actual directory change.

REMOTEHOST (+)
The host from which the user has logged in remotely, if this is the case and the shell is able to determine it. Set only if the shell was so compiled; see the version shell variable.

SHLVL (+)
Equivalent to the shlvl shell variable.

SYSTYPE (+)
The current system type. (Domain/OS only)

TERM
Equivalent to the term shell variable.

TERMCAP
The terminal capability string. See Terminal management.

USER
Equivalent to the user shell variable.

VENDOR (+)
The vendor, as determined at compile time.

VISUAL
The pathname to a default full-screen editor. See also the EDITOR environment variable and the run-fg-editor editor command.

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