The following environment variables affect the execution of ls (and ls-F):
The following environment variables affect the execution of ls (and ls-F):
BLOCKSIZE
If the environment variable BLOCKSIZE is set, the block
counts (see -s) will be displayed in units of that size block.
CLICOLOR
Use ANSI color sequences to distinguish file types. See
LSCOLORS below. In addition to the file types mentioned
in the -F option some extra attributes (setuid bit set,
etc.) are also displayed. The colorization is dependent
on a terminal type with the proper termcap(5) capabili-
ties. The default ''cons25'' console has the proper
capabilities, but to display the colors in an xterm(1),
for example, the TERM variable must be set to
'xterm-color'. Other terminal types might require similar
adjustments. Colorization is silently disabled if
the output isn’t directed to a terminal unless the
CLICOLOR_FORCE variable is defined.
CLICOLOR_FORCE
Color sequences are normally disabled if the output isn’t
directed to a terminal. This can be overridden by set-
ting this flag. The TERM variable still needs to refer-
ence a color capable terminal however otherwise it is not
possible to determine which color sequences to use.
COLUMNS
If this variable contains a string representing a decimal
integer, it is used as the column position width for displaying
multiple-text-column output. The ls utility calculates
how many pathname text columns to display based
on the width provided. (See -C and -x.)
LANG
The locale to use when determining the order of day and
month in the long -l format output. See environ(7) for
more information.
LISTLINKS
If the 'listlinks' shell variable is set, ls-F will identify symbolic links
in more detail (only on systems that have them, of course):
@ Symbolic link to a non-directory
> Symbolic link to a directory
& Symbolic link to nowhere
listlinks also slows down ls-F and causes partitions holding files
pointed to by symbolic links to be mounted.
LISTFLAGS
If the 'listflags' shell variable is set to 'x', 'a' or 'A', or
any combination thereof (e.g., 'xA'), they are used as flags to ls-F,
making it act like 'ls -xF', 'ls -Fa', 'ls -FA' or a combination (e.g., 'ls -FxA').
On machines where 'ls -C' is not the default, ls-F acts like 'ls -CF',
unless listflags contains an 'x', in which case it acts like 'ls -xF'.
ls-F passes its arguments to ls(1) if it is given any switches,
so 'alias ls ls-F' generally does the right thing.
The ls-F builtin can list files using different colors depend-
ing on the filetype or extension. See the color tcsh variable
and the LSCOLORS environment variable (below).
LSCOLORS
The value of this variable describes what color to use
for which attribute when colors are enabled with
CLICOLOR. This string is a concatenation of pairs of the
format fb, where f is the foreground color and b is the
background color.
The color designators are as follows:
a black
b red
c green
d brown
e blue
f magenta
g cyan
h light grey
A bold black, usually shows up as dark grey
B bold red
C bold green
D bold brown, usually shows up as yellow
E bold blue
F bold magenta
G bold cyan
H bold light grey; looks like bright white
x default foreground or background
Note that the above are standard ANSI colors. The actual
display can differ depending on the color capabilities of
the terminal in use.
The order of the attributes are as follows:
1. directory
2. symbolic link
3. socket
4. pipe
5. executable
6. block special
7. character special
8. executable with setuid bit set
9. executable with setgid bit set
10. directory writable to others, with sticky bit
11. directory writable to others, without sticky
bit
The default is "exfxcxdxbxegedabagacad", i.e. blue fore-
ground and default background for regular directories,
black foreground and red background for setuid executa-
bles, etc.
LS_COLWIDTHS
If this variable is set, it is considered to be a colon-
delimited list of minimum column widths. Unreasonable
and insufficient widths are ignored (thus zero signifies
a dynamically sized column). Not all columns have
changeable widths. The fields are, in order: inode,
block count, number of links, user name, group name,
flags, file size, file name.
TERM The CLICOLOR functionality depends on a terminal type
with color capabilities.
TZ The timezone to use when displaying dates. See
environ(7) for more information.
“If the doors of perception were cleansed every thing would appear to man as it is, infinite” ~ William Blake
dir - Briefly list directory contents.
ls - List information about FILEs.
wc - Print byte, word, and line counts.
Equivalent Windows commands:
DIR - Display a list of files and folders.