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+Tips for listing files with ls at the Linux command line
+======
+Learn some of the Linux 'ls' command's most useful variations.
+![](https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/button_push_open_keyboard_file_organize.png?itok=KlAsk1gx)
+
+One of the first commands I learned in Linux was `ls`. Knowing what’s in a directory where a file on your system resides is important. Being able to see and modify not just some but all of the files is also important.
+
+My first LInux cheat sheet was the [One Page Linux Manual][1] , which was released in1999 and became my go-to reference. I taped it over my desk and referred to it often as I began to explore Linux. Listing files with `ls -l` is introduced on the first page, at the bottom of the first column.
+
+Later, I would learn other iterations of this most basic command. Through the `ls` command, I began to learn about the complexity of the Linux file permissions and what was mine and what required root or sudo permission to change. I became very comfortable on the command line over time, and while I still use `ls -l` to find files in the directory, I frequently use `ls -al` so I can see hidden files that might need to be changed, like configuration files.
+
+According to an article by Eric Fischer about the `ls` command in the [Linux Documentation Project][2], the command's roots go back to the `listf` command on MIT’s Compatible Time Sharing System in 1961. When CTSS was replaced by [Multics][3], the command became `list`, with switches like `list -all`. According to [Wikipedia][4], `ls` appeared in the original version of AT&T Unix. The `ls` command we use today on Linux systems comes from the [GNU Core Utilities][5].
+
+Most of the time, I use only a couple of iterations of the command. Looking inside a directory with `ls` or `ls -al` is how I generally use the command, but there are many other options that you should be familiar with.
+
+`$ ls -l` provides a simple list of the directory:
+
+![](https://opensource.com/sites/default/files/uploads/linux_ls_1_0.png)
+
+Using the man pages of my Fedora 28 system, I find that there are many other options to `ls`, all of which provide interesting and useful information about the Linux file system. By entering `man ls` at the command prompt, we can begin to explore some of the other options:
+
+![](https://opensource.com/sites/default/files/uploads/linux_ls_2_0.png)
+
+To sort the directory by file sizes, use `ls -lS`:
+
+![](https://opensource.com/sites/default/files/uploads/linux_ls_3_0.png)
+
+To list the contents in reverse order, use `ls -lr`:
+
+![](https://opensource.com/sites/default/files/uploads/linux_ls_4.png)
+
+To list contents by columns, use `ls -c`:
+
+![](https://opensource.com/sites/default/files/uploads/linux_ls_5.png)
+
+`ls -al` provides a list of all the files in the same directory:
+
+![](https://opensource.com/sites/default/files/uploads/linux_ls_6.png)
+
+Here are some additional options that I find useful and interesting:
+
+  * List only the .txt files in the directory: `ls *.txt`
+  * List by file size: `ls -s`
+  * Sort by time and date: `ls -d`
+  * Sort by extension: `ls -X`
+  * Sort by file size: `ls -S`
+  * Long format with file size: `ls -ls`
+  * List only the .txt files in a directory: `ls *.txt`
+
+
+
+To generate a directory list in the specified format and send it to a file for later viewing, enter `ls -al > mydirectorylist`. Finally, one of the more exotic commands I found is `ls -R`, which provides a recursive list of all the directories on your computer and their contents.
+
+For a complete list of the all the iterations of the `ls` command, refer to the [GNU Core Utilities][6].
+
+--------------------------------------------------------------------------------
+
+via: https://opensource.com/article/18/10/ls-command
+
+作者：[Don Watkins][a]
+选题：[lujun9972](https://github.com/lujun9972)
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://opensource.com/users/don-watkins
+[1]: http://hackerspace.cs.rutgers.edu/library/General/One_Page_Linux_Manual.pdf
+[2]: http://www.tldp.org/LDP/LG/issue48/fischer.html
+[3]: https://en.wikipedia.org/wiki/Multics
+[4]: https://en.wikipedia.org/wiki/Ls
+[5]: http://www.gnu.org/s/coreutils/
+[6]: https://www.gnu.org/software/coreutils/manual/html_node/ls-invocation.html#ls-invocation