add the old snippet md files

old_snippets/awk-last-column.en.md

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+---
+title: "awk last column"
+seo_description: "Shell snippet explaining how to extract the last column using awk"
+date: 2022-02-13T10:46:08+01:00
+draft: false
+snippet_types:
+- awk
+---
+
+My first [awk](https://en.wikipedia.org/wiki/AWK) snippet! Today I needed to get
+all the file extensions in directory for a blog post I'm writing.
+
+I solved it with:
+
+```shell
+$ fd . --type f | awk -F"." '{print $(NF)}' |  tr  '[:upper:]' '[:lower:]' | sort | uniq | pbcopy
+```
+
+## Break down
+
+**fd . --type f**, lists all the files in a directory recursively.
+
+**awk -F"." '{print $(NF)}'**, the **-F"."** tells awk to split columns on ".". The **'{print $(NF)'}** tells awk to print the last column.
+Normally you do something like **'{print $2}'** to print the second column.
+
+**tr '[:upper:]' '[:lower:]'**, tr is a Unix until to translate characters. In
+this case all upper case letters will be translated to lower case. I've created a
+[seprate snippet](/snippets/lower-case) for it as well.
+
+**sort | uniq**, a classic combo sorts the results then gets rid of duplicates.
+
+**pbcopy**, anther common one for me pipes the result into the clipboard.
+
+[source](https://linuxhint.com/awk_print_last_column_file/)