Added Updates

functions/pack.fish

@@ -0,0 +1,16 @@
+function pack
+    if test (count $argv) -lt 2
+        echo "Usage: pack <archive-name> <file-or-dir> [more files...]"
+        return 1
+    end
+
+    set archive $argv[1]
+    set targets $argv[2..-1]
+
+    # Ensure .tar.xz extension
+    if not string match -r '\.tar\.xz$' -- $archive
+        set archive "$archive.tar.xz"
+    end
+
+    tar -cJvf $archive $targets
+end