LS(1)

NAME
ls - list directory contents

SYNOPSIS
ls [-1AaCcdFfgHhikLlmnopqRrSsTtux] [file ...]

DESCRIPTION
For each operand that names a file of a type other than directory, ls displays its name as well as any requested, associated information. For each named directory, ls displays the names of files contained within that directory, as well as any requested, associated information.

If no operands are given, the contents of the current directory are displayed. If more than one operand is given, non-directory operands are displayed first; directory and non-directory operands are sorted separately and in lexicographical order. By default, ls lists one entry per line to standard output; the exceptions are to terminals or when the -C, -m, or -x options are specified.

The options are as follows:

-1  (The numeric digit “one”.) Force output to be one entry per line. This is the default when output is not to a terminal.

-A  List all entries except for ‘’. and ‘..’. Always set for the superuser.

-a  Include directory entries whose names begin with a dot (‘’)..

-C  Force multi-column output; this is the default when output is to a terminal.

-c  Use time file's status was last changed instead of last modification time for sorting (-t) or printing (-g, -l, or -n).

-d  Directories are listed as plain files (not searched recursively) and symbolic links in the argument list are not indirected through.

-F  Display a slash (‘/’) immediately after each pathname that is a directory, an asterisk (‘*’) after each that is executable, an at sign (‘@’) after each symbolic link, an equal sign (‘=’) after each socket, and a vertical bar (‘|’) after each that is a FIFO.

-f  Output is not sorted.

-g  List in long format as in -l, except that the owner is not printed.

-H  Follow symbolic links specified on the command line. This is the default behaviour when none of the -d, -F, or -l options are specified.

-h  When used with a long format option, use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte, Petabyte, and Exabyte in order to reduce the number of digits to four or fewer using powers of 2 for sizes (K=1024, M=1048576, etc.).

-i  For each file, print its inode number.

-k  Modifies the -s option, causing the sizes to be reported in kilobytes. Overrides any value specified by the BLOCKSIZE environment variable.

-L  If argument is a symbolic link, evaluate the file information and file type to be those of the file referenced by the link, and not the link itself; however, ls writes the name of the link itself and not the file referenced by the link.

-l  (The lowercase letter “ell”.) List in long format (see below). A total sum of all file sizes is output on a line before the long listing. Output is one entry per line.

-m  Stream output format; list files across the page, separated by commas.

-n  List in long format as in -l, but retain user and group IDs in a numeric format. The output of -gn and -ng is identical: a long listing with numerical group ID, and no numerical user ID. The output of -ln and -nl is identical: a long listing with numerical group and user ID.

-o  Include the file flags in a long format (-g, -l, or -n) output.

-p  Display a slash (‘/’) immediately after each pathname that is a directory.

-q  Force printing of non-graphic characters in file names as the character ‘’?; this is the default when output is to a terminal.

-R  Recursively list subdirectories encountered.

-r  Reverse the order of the sort to get reverse lexicographical order or the smallest or oldest entries first.

-S  Sort by size, largest file first.

-s  Display the number of file system blocks actually used by each file, where partial units are rounded up to the next integer value. Blocks are 512 bytes unless overridden by the -k flag or BLOCKSIZE environment variable.

-T  Display complete time information for the file, including month, day, hour, minute, second, and year. This option has no effect unless one of the long format (-g, -l, or -n) options is also specified.

-t  Sort by time modified (most recently modified first) before sorting the operands in lexicographical order.

-u  Use file's last access time instead of last modification time for sorting (-t) or printing (-g, -l, or -n).

-x  Multi-column output sorted across the page rather than down the page.

It is not an error to specify more than one of the following mutually exclusive options: -1, -C, -g, -l, -m, -n, and -x; and -c, -f, -S, -t, and -u. Where more than one option is specified from the same mutually exclusive group, the last option given overrides the others, except that -l always overrides -g; and -f always overrides -c, -S, -t, and -u.

  The Long Format
If the -g, -l, or -n options are given, the following information is displayed for each file: mode, number of links, owner (though not for -g), group, size in bytes, time of last modification (“mmm dd HH:MM”), and the pathname. In addition, for each directory whose contents are displayed, the first line displayed is the total number of blocks used by the files in the directory. Blocks are 512 bytes unless overridden by the -k option or BLOCKSIZE environment variable.

If the owner or group name is not a known user or group name, respectively, or the -n option is given, the numeric ID is displayed.

If the file is a character special or block special file, the major and minor device numbers for the file are displayed in the size field.

If the -T option is given, the time of last modification is displayed using the format “mmm dd HH:MM:SS ccyy”.

If the file is a symbolic link, the pathname of the linked-to file is preceded by “-”.

The file mode printed under the -g, -l, or -n options consists of the entry type, owner permissions, group permissions, and other permissions. The entry type character describes the type of file, as follows:

-   regular file
b   block special file
c   character special file
d   directory
l   symbolic link
p   FIFO
s   socket link

The next three fields are three characters each: owner permissions, group permissions, and other permissions. Each field has three character positions:

1.  If r, the file is readable; if -, it is not readable.
2.  If w, the file is writable; if -, it is not writable.
3.  The first of the following that applies:

    S   If in the owner permissions, the file is not executable and set-user-ID mode is set. If in the group permissions, the file is not executable and set-group-ID mode is set.

    s   If in the owner permissions, the file is executable and set-user-ID mode is set. If in the group permissions, the file is executable and setgroup-ID mode is set.

    x   The file is executable or the directory is searchable.

    -   The file is neither readable, writable, executable, nor set-user-ID, nor set-group-ID, nor sticky (see below).

    These next two apply only to the third character in the last group (other permissions):

    T   The sticky bit is set (mode 1000), but neither executable nor searchable (see chmod(1) or sticky(8)).

    t   The sticky bit is set (mode 1000), and is searchable or executable (see chmod(1) or sticky(8)).

In addition, if the -o option is specified, the file flags (see chflags(1)) are displayed as comma-separated strings in front of the file size, abbreviated as follows:

-   no flags
arch
    archived
nodump
    do not dump
sappnd
    system append-only
schg
    system immutable
uappnd
    user append-only
uchg
    user immutable

ENVIRONMENT

BLOCKSIZE
    If the environment variable BLOCKSIZE is set, and the -k option is not specified, the block counts (see -s) will be displayed in units of that size block.

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.

TZ  The time zone to use when displaying dates. See environ(7) for more information.

EXIT STATUS

EXAMPLES
List the contents of the current working directory in long format:

    $ ls -l

In addition to listing the contents of the current working directory in long format, show inode numbers, file flags (see chflags(1)), and suffix each filename with a symbol representing its file type:

    $ ls -lioF

List the files in /var/log, sorting the output such that the mostly recently modified entries are printed first:

    $ ls -lt /var/log

SEE ALSO
chflags(1), chmod(1), symlink(7), sticky(8)

STANDARDS
The ls utility is compliant with the p1003.1-2008 specification.

The flags [-hT] are extensions to that specification.

Historically, the -g flag was used to specify that the group field be included in long listings. The group field is now automatically included in the long listing for files and the meaning of the -g flag has been changed in order to be compatible with the p1003.1-2008 specification.

Behaviour for the -f and -o flags differs between this implementation and p1003.1-2008.

HISTORY
An ls utility appeared in AT&T UNIX.