Answer:
It is a Linux command "ls" with flag "-l" (lowercase "L").
Step-by-step explanation:
This command lists directory content. Every so often It can have a couple of preconfigured aliases, such as: "l" ("ls -CF") - list, "la" ("ls -A") - list all, "ll" ("ls -alF") - list long.
Flag "-a" (short for "all") includes directory entries whose names begin with a dot ("."), that is, to put it bluntly, hidden files.
Flag "-A" (short for "All") does the same as the previous flag excluding both "." (the working directory, also known as the current directory) and ".." (the parent directory). It is automatically set for the super-user.
Flag "-C" forces multi-column output, that is the default when output is to a terminal.
Flag "-F" displays a slash ("/") immediately after each pathname that is a directory, an asterisk ("*") after each that is executable. Also does some additional stuff: find out what its kind, use a Linux command "man".
Flag "-l" lists files in the long format: file type ("-" - file, "d" - directory, "l" - link, and such), file mode (permissions: "r" - readable, "w" - writeable, "x" - executable for files or searchable for directories, etc.) for owners, groups, and others. Additionally, there are number of links, owner name, group name, number of bytes in the file, abbreviated month, day-of-month file was last modified, hour file last modified, minute file last modified, and the pathname.
Note that everything is conceptualized as files in Unix.
I am personally making use of my own alias "ls" ("ls -aFGhl").
Flag "-G" enables colorized output.
Flag "-h" makes sense as long as it pairs up with flag "-l". It uses unix suffixes, such as: B (byte), K (kilobyte), M (megabyte), G (gigabyte), T (terabyte), and P (petabyte) metamorphosing sizes into a human-readable format.
Create an alias by yourself: bring a Linux command "alias" into play. The produced alias lasts for one session. In order to make it last forever, place this command into your ".bashrc" (for bash, Bourne again shell, named after Stephen Bourne: the homophones "Bourne" and "born" are quite a wordplay): the path is "~/.bashrc" or ".zshrc" (for zsh, the Z shell, named after Zhong Shao: no play on words, lit shell instead): the path is "~/.zshrc". These files are executed when you launch your terminal: a Linux command "source" can run a specific file at your current shell without the relaunch. Type in "which $SHELL" to make certain of the shell which you are currently working at. Get rid of the alias if you are fed up with it: if it is temporary, a Linux command "unalias" comes in handy. Otherwise, delete it from your previously mentioned file.
Last but not least: if you do not know what command to use... Or just do not remember, consult your computer: bring a Linux command "apropos" into play. Kindly do not let it slip your mind, pal)
Let me get you through it: you need "a command that displays a list of files or folders and their most common properties", be short and sweet: type in "apropos list". It will provide you with all the related goodies.
Also take a Linux command "lsof" (list open files) into consideration. It does what it stands for belonging to all the active processes. Be cautious with it: there are usually a great deal of them.