add the old snippet md files

old_snippets/gzip-existing-tar.en.md

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+---
+title: "gzipping an existing tar"
+date: 2020-10-14T09:12:54+02:00
+draft: false
+snippet_types:
+- tar
+- gzip
+---
+
+Part of my work process is taking lots of screenshot, ~5 per day. Then I back them up in AWS S3
+Glacier once a month, using [freeze
+app](https://apps.apple.com/us/app/freeze-for-amazon-glacier/id1046095491?mt=12). Like to start with
+creating a regular tar file in /tmp.
+
+```shell
+$ tar cvf /tmp/pic_dump_14_10_20.tar ~/Desktop/**/*.png
+```
+
+Then append few more images. `r` in this case sanding for append..
+
+```shell
+$ tar rfv /tmp/pic_dump_14_10_20.tar ~/Pictures/resized/*
+```
+
+Now that the tar is complete I double check it by listing the files. 
+
+```shell
+$ tar tf /tmp/pic_dump_14_10_20.tar
+```
+
+Lastly I need to compress the tar and I was confused if I could use tar command itself to compress a
+tar into a tar.gz but turns you use gunzip.
+
+```shell
+$ gzip /tmp/pic_dump_14_10_20.tar
+```
+
+
+
+source: https://alvinalexander.com/blog/post/linux-unix/how-work-files-tar-gzip-tgz/ (4)
+