Make extract a separate script

scripts/extract

@@ -0,0 +1,57 @@
+#! /bin/bash
+
+extract() {
+  if [ -f "$1" ]; then
+    case "$1" in
+    *.tar.bz2)
+      command -v tar >/dev/null || sudo apt install -y tar
+      tar xjvf "$1"
+      ;;
+    *.tar.gz)
+      command -v tar >/dev/null || sudo apt install -y tar
+      tar xzvf "$1"
+      ;;
+    *.bz2)
+      command -v bunzip2 >/dev/null || sudo apt install -y bzip2
+      bunzip2 "$1"
+      ;;
+    *.rar)
+      command -v unrar >/dev/null || sudo apt install -y unrar
+      unrar e "$1"
+      ;;
+    *.gz)
+      command -v gunzip >/dev/null || sudo apt install -y gzip
+      gunzip "$1"
+      ;;
+    *.tar)
+      command -v tar >/dev/null || sudo apt install -y tar
+      tar xf "$1"
+      ;;
+    *.tbz2)
+      command -v tar >/dev/null || sudo apt install -y tar
+      tar xjf "$1"
+      ;;
+    *.tgz)
+      command -v tar >/dev/null || sudo apt install -y tar
+      tar xzf "$1"
+      ;;
+    *.zip)
+      command -v unzip >/dev/null || sudo apt install -y unzip
+      unzip "$1"
+      ;;
+    *.Z)
+      command -v uncompress >/dev/null || sudo apt install -y ncompress
+      uncompress "$1"
+      ;;
+    *.7z)
+      command -v 7z >/dev/null || sudo apt install -y p7zip
+      7z x "$1"
+      ;;
+    *)
+      echo "'$1' cannot be extracted via extract()"
+      ;;
+    esac
+  else
+    echo "'$1' is not a valid file"
+  fi
+}