Added tar notes to the knowledge base

knowledge base/tar.md

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+# Tar
+
+## TL;DR
+
+```shell
+# create an archive
+tar czvf directory.tar.gz directory
+tar capvf archive.tar.bz2 directory1 directory2 file
+
+# list the content of an archive
+tar tf archive.tar
+tar tf archive.tar member
+
+# extract an archive
+tar xpf archive.tar
+tar xapf archive.tar.gz
+tar xjpf archive.tar.bz2 file
+```
+
+## Interesting switches
+
+short | long              | description
+------|-------------------|--------------------------------------------------------------------------------------------------------
+`-a`  | `--auto-compress` | use archive suffix to determine the compression program
+`-c`  | `--create`        | create a new archive; directories are archived recursively, unless the `--no-recursion` option is given
+`-C`  | `--directory DIR` | change to DIR before performing any operations; this option affects all options that follow
+`-f`  | `--file FILE`     | use archive file or device FILE; if not given, tar will first examine the environment variable `TAPE` and default to the compiled-in default
+`-r`  | `--append`        | append files to the end of an archive
+`-t`  | `--list`          | list the contents of an archive; arguments are optional, but when given they specify the names of the members to list
+
+## Further readings
+
+- [how to compress and extract files using the tar command on linux]
+- [how to create tar gz file in linux using command line]
+
+[how to create tar gz file in linux using command line]: https://www.cyberciti.biz/faq/how-to-create-tar-gz-file-in-linux-using-command-line/
+[how to compress and extract files using the tar command on linux]: https://www.howtogeek.com/248780/how-to-compress-and-extract-files-using-the-tar-command-on-linux/