Upd

solution/untar

@@ -0,0 +1,18 @@
+#!/usr/bin/bash
+
+if [ "$#" -ne 1 ]; then
+ exit 1
+fi
+
+archive="$1"
+
+if [ ! -f "$archive" ]; then
+ exit 1
+fi
+
+unpacked_dir="${archive}.unpacked"
+
+if [ ! -d "$unpacked_dir" ]; then
+ mkdir "$unpacked_dir"
+fi
+tar -xf "$archive" -C "$unpacked_dir"