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ls
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<p>ls is a <a href="/facts/Shell_(computing)/Sa67elS7">shell</a> <a href="/facts/Command_(computing)/zUrvQbFy">command</a> for listing <a href="/facts/Computer_file/FjFH3Ufm">files</a> – including <a href="/facts/Unix_file_type/CplllKdU">special files</a> such as <a href="/facts/Computer_directory/VLtLcEXY">directories</a>. Originally developed for <a href="/facts/Unix/0pNL2seI">Unix</a> and later codified by <a href="/facts/POSIX/mQkSt234">POSIX</a> and <a href="/facts/Single_UNIX_Specification/w1ba5bDt">Single UNIX Specification</a>, it is supported in many <a href="/facts/Operating_system/8XTuvMh2">operating systems</a> today, including <a href="/facts/Unix-like/YAKrAxzd">Unix-like</a> variants, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a> (via <a href="/facts/PowerShell/G1d10lwn">PowerShell</a> and <a href="/facts/UnxUtils/CsUBGmUM">UnxUtils</a>), <a href="/facts/Unified_Extensible_Firmware_Interface/w86VGmy2">EFI</a>, and <a href="/facts/MSX-DOS/xbb74Lbw">MSX-DOS</a> (via <a href="/facts/ASCII_Corporation/Vf2w3L9X">MSX-DOS2 Tools</a>). </p><p>The <a href="/facts/Numerical_analysis/QT9cYa9z">numerical computing</a> environments <a href="/facts/MATLAB/qPjLISCk">MATLAB</a> and <a href="/facts/GNU_Octave/vVVq5evM">GNU Octave</a> include an ls command with similar functionality. </p><p>In other environments, such as <a href="/facts/DOS/sWwDXNmX">DOS</a>, <a href="/facts/OS%2f2/uVBl6ItP">OS/2</a>, and <a href="/facts/Command_Prompt/FUmTvew6">Command Prompt</a>, similar functionality is provided by the <a href="/facts/Dir_(command)/oosA54R0">dir</a> command. </p><p>An ls command appeared in the first version of <a href="/facts/AT%2526T_Corporation/BfsX7eX2">AT&T</a> <a href="/facts/Unix/0pNL2seI">UNIX</a>, the name inherited from <a href="/facts/Multics/y7A5peyu">Multics</a> and short for "list". ls is part of the <a href="/facts/X%2fOpen/btwVKbX2">X/Open</a> Portability Guide since issue 2 of 1987. It was inherited into the first version of POSIX.1 and the <a href="/facts/Single_Unix_Specification/w1ba5bDt">Single Unix Specification</a>. </p>