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ls lists information about files and directories. With no operand it examines the current directory; with a directory operand it shows that directory’s contents, non-recursively by default. Names beginning with a period are hidden unless you request them.
This guide covers the portable POSIX behavior, GNU/Linux extensions, metadata, recursion, sorting, symlinks, locale effects, scripting concerns, and practical commands you can use safely on Linux and Unix systems.
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The command’s basic form is:
ls [OPTION]... [FILE]...GNU ls lists information about files of any type, including directories. If you provide no non-option argument, it acts as though you specified ., the current directory. If you provide a directory such as /var/log, it lists that directory’s entries rather than displaying the directory entry itself.
For example:
ls
ls /var/log
ls report.txtThe first command lists the current working directory, the second lists the contents of /var/log, and the third reports information about one named file. A directory is not traversed recursively unless you request recursion.
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GNU permits options and file operands to be intermixed, but scripts should put options first and use an uncomplicated, documented command line. Option parsing details can differ between implementations.
Show hidden files and control which names are included
Entries whose names begin with . are omitted from an ordinary listing. This includes ordinary hidden files and the special directory entries . and ...
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ls -a-a means “all”: it includes names beginning with a period, including the implied current- and parent-directory entries. The option is defined by both GNU and POSIX ls.
Include hidden names but omit . and .. with -A
ls -A-A (“almost all”) shows hidden names while suppressing the two implied entries. This is usually the clearest choice when you want to inspect configuration files without the visual noise of . and ...
Hide selected names in GNU ls
GNU implementations provide pattern-based controls such as --hide=PATTERN. They are useful when a directory contains generated files you do not want in a particular view. These long options are GNU extensions, not a portable Unix baseline, so check the target system before using them in scripts.
Read the long format with -l
ls -lThe long format displays extended metadata instead of only names. Typical implementations show a file-type and permission field, link count, owner, group, size, a modification timestamp, and the name. The exact columns, timestamp presentation, and available identity fields are implementation-dependent; do not assume that every Unix variant prints precisely the GNU layout.
Combining -l with -a is the common way to inspect all entries and their metadata:
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ls -laThe difference between ls -l and ls -la is therefore the inclusion of dot files, not a different metadata format. -l alone still omits names beginning with a period.
Inspect a directory entry instead of its contents
ls -ld /var/log-d tells ls not to descend into a directory operand. Without it, ls -l /var/log displays the entries inside /var/log; with it, the command displays the metadata for the /var/log directory itself. POSIX includes -d.
Other metadata controls
-irequests inode numbers where supported by the implementation.-srequests allocated-block information; block accounting depends on the filesystem and implementation.-nuses numeric user and group IDs instead of resolving names on implementations that provide it.-gand-oadjust owner/group columns on systems that support the traditional Unix meanings.- GNU
--authoradds an author column when that metadata is available. - GNU
--block-size=SIZEselects the unit used for displayed block counts or sizes. It is an extension and should be labeled as such in portable documentation.
For readable approximate units on GNU/Linux, use:
ls -lhThe -h presentation is a GNU/common extension rather than a guarantee of every Unix ls.
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ls -R project-R recursively lists the contents of project and each directory below it. Output is grouped by directory, with a directory heading followed by its entries.
Recursion can become very large on source trees, home directories, mounted filesystems, or directories containing dependency caches. It also encounters permission errors and can take considerably longer than a single-directory listing. Use a specific starting path, and consider a focused command such as ls -R project/src rather than beginning at a broad location such as /.
Recursion and the handling of symlinked directories can vary with implementation and options. If you need an exact traversal policy, verify the behavior of the ls supplied by that Unix system.
Sort by name, time, or size
Name order is the normal default. Sorting is affected by the current locale, so the same set of names can appear in a different order on systems using different locale settings.
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Modification time
ls -lt
ls -ltr-t sorts by modification time, newest first. Adding -r reverses the resulting order, so ls -ltr shows the oldest entries first. Date precision and tie-breaking details are implementation-dependent.
File size
ls -lS
ls -lSr-S sorts by size, largest first; -r reverses it. GNU and many Unix implementations provide this option, but verify it when targeting a narrowly defined POSIX environment. Pairing it with -h affects display units, not the underlying numeric comparison:
ls -lhSOther time fields
Unix implementations commonly provide switches that select access time or status-change time, traditionally -u and -c, often combined with -t. Their exact interaction and timestamp semantics should be checked against the local manual page, especially on non-GNU systems.
Make a predictable sort for scripts
LC_ALL=C ls -1GNU documentation recommends LC_ALL=C when a stable, locale-independent ordering is required. -1 requests one entry per line where supported. This makes output easier to inspect or pass through simple tools, but it does not make arbitrary filenames safe to parse; unusual characters can still require quoting or escaping.
Control output layout, quoting, and colors
On an interactive terminal, GNU ls normally arranges names in columns. When standard output is redirected, GNU ls normally emits one name per line. Terminal width, locale, quoting settings, and implementation all influence the final appearance.
Force one entry per line
ls -1Use -1 when a one-per-line view is easier to read or when you want to avoid terminal column wrapping. It is included in the POSIX option set.
Choose other layouts
POSIX systems may support column, comma-separated, or across-the-page layouts through options such as -C, -m, and -x. These are presentation choices, not changes to which files are selected.
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Classify entries and use color
-F appends indicators such as a slash for directories on implementations that support it. GNU --color enables colorized output according to terminal and environment settings. Both classification details and color defaults vary, so do not treat visual markers as machine-readable data.
Unusual characters in names
Filenames can contain spaces, tabs, newlines, and other characters. Implementations may quote, escape, or replace non-printing characters; POSIX includes -q for displaying non-printing characters as question marks. When preserving exact filenames matters, use a file-oriented interface designed for machine processing rather than parsing a human-formatted ls screen.
Understand symlinks and directory operands
Default symlink behavior
In a long listing, a symbolic link is normally shown as a link, often with its target displayed after an arrow. Metadata describes the link itself rather than the target unless you request dereferencing.
Follow links with GNU -L
ls -lL linknameGNU -L dereferences symbolic links when obtaining file information, so the reported mode, owner, size, and timestamps come from the target where it can be reached. This is a GNU/common behavior; check the target implementation when portability matters.
Combine -L and -d deliberately
These options answer different questions: -d controls whether a directory operand is descended into, while -L controls whether symbolic links are followed for metadata. Combining them can be useful when auditing a link or mount point, but test the exact result on the Unix variant you administer.
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GNU/Linux versus portable POSIX ls
POSIX defines a useful baseline synopsis:
ls [-ikqrs] [-glno] [-A|-a] [-C|-m|-x|-1] [-F|-p] [-H|-L] [-R|-d] [-S|-f|-t] [-c|-u] [file...]That baseline covers selection, metadata, layout, recursion, link handling, and common sort controls. Real systems can still differ in defaults, column headings, timestamp formatting, and extensions.
| Capability | Portable baseline | GNU or implementation-specific examples |
|---|---|---|
| Hidden names | -a, -A |
--almost-all is GNU long-option spelling for almost all |
| Metadata | -l, -i, -s, traditional owner/group switches |
--author, --block-size=SIZE |
| Traversal | -R, -d |
Detailed symlink and recursion behavior can vary by implementation |
| Sorting | Name order plus common time/size controls in the POSIX synopsis | GNU offers additional time and formatting controls such as --time-style |
| Display | -1, -C, -m, -x, -F, -p |
--color, --hide=PATTERN, richer quoting controls |
If a command must run on several Unix families, stay within the POSIX set, avoid GNU long options, and test the exact target shells and utilities. If you specifically administer GNU/Linux, GNU extensions can improve readability and filtering but should be labeled in documentation and scripts.
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The GNU Project’s current documentation identifies GNU Coreutils 9.11 (2026 documentation) as the relevant version line. Other systems may ship a different release or a non-GNU implementation.
Practical command recipes
See everything, including hidden files, with readable metadata
ls -lahThis combines all-name selection, long metadata, and human-readable sizes on GNU/Linux.
Find the largest entries in the current directory
ls -lhSThe largest entries appear first. Add -a if hidden files must be included.
See the newest files first
ls -ltAdd -r for oldest first.
Inspect a directory itself
ls -ld /etc
ls -ld /path/to/linkUse this when you need permissions and ownership on the directory or link object, not a listing of its contents.
Inventory a tree
ls -lR projectUse a narrowly scoped path and expect separate headings for each subdirectory.
Stabilize locale and line layout
LC_ALL=C ls -1 /var/logThis requests a consistent C-locale ordering and one entry per line on implementations that support -1.
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Exit statuses, errors, and troubleshooting
GNU ls returns status 0 when all requested work succeeds, 1 for minor problems, and 2 for serious trouble such as an invalid option or failure to access a specified operand. Check the status in a shell with echo $? immediately after the command.
- “invalid option”: The switch may be GNU-only, misspelled, or unsupported by the installed Unix implementation. Consult that system’s
lsmanual and replace it with a POSIX option where possible. - A directory appears empty: Ordinary
lshides dot files. Tryls -Aorls -a. - You expected directory metadata but saw contents: Add
-dto inspect the directory operand itself. - Order differs between machines: Locale affects name sorting. Use
LC_ALL=Cwhen a stable byte-oriented order is appropriate. - Names or columns look strange: Terminal width, quoting rules, non-printing characters, and color settings affect presentation. Use
-1for a simpler view and avoid parsing decorative output. - Recursion is slow or incomplete: Narrow the starting path, check permissions, and remember that
-Rwalks every reachable subdirectory rather than just the first level. - Link metadata seems unexpected: Decide whether you need the link object or its target, then use the default behavior or GNU
-Laccordingly.
Using ls safely in scripts
ls is primarily a human inspection tool. Its columns, quoting, color, locale sorting, and treatment of unusual filenames are designed for display, not a stable data interchange format. Redirecting output and adding -1 can make a simple diagnostic easier to read, but it does not eliminate ambiguities caused by newlines, tabs, or escape characters in filenames.
For automation, prefer interfaces that expose filenames as records with explicit delimiters and metadata fields. If you nevertheless call ls from a script, set the locale deliberately, place options consistently, disable visual decorations, check the exit status, and document whether the script requires GNU ls or only POSIX behavior.
Quick decision guide
- Just see the current directory:
ls. - Include hidden names without
.and..:ls -A. - Include every name:
ls -a. - Show permissions and ownership:
ls -l. - Inspect a directory itself:
ls -ld DIRECTORY. - Walk a tree:
ls -R DIRECTORY. - Sort newest first:
ls -lt. - Sort largest first:
ls -lS. - Make one-per-line, locale-stable output:
LC_ALL=C ls -1. - Follow a symbolic link for metadata on GNU/Linux:
ls -lL LINK.
The right command depends on whether you are selecting names, exposing metadata, changing traversal, sorting entries, or controlling presentation. Treat GNU enhancements as conveniences with a portability cost, and keep POSIX options for commands that must cross Unix implementations.
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