first code

filediff.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+
+# Check for at least one parameter
+if [ "$#" -lt 1 ]; then
+    cat >&2 << EOF
+
+Usage: $0 <command> [parameters]
+
+EOF
+fi
+
+# Check for commands existance
+find &>/dev/null
+if [ "$?" -ne 0 ]; then
+    cat >&2 << EOF
+Unable to proceed without \`find\`.
+EOF
+fi
+
+TMPDIR="$(mktemp -d)"
+BEFORE="$TMPDIR/before.tree"
+AFTER="$TMPDIR/after.tree"
+
+find . > $BEFORE
+output=$(eval "$@")
+find . > $AFTER
+
+if [ "$output" != "" ]; then
+    echo "$output"
+    echo
+fi
+diff --color=always $BEFORE $AFTER | tail -n-1
+
+rm $TMPDIR/*
+rmdir $TMPDIR