make noise while running the test if its not there

make_noise.sh

@@ -1,3 +0,0 @@
-#!/bin/bash
-rm -f noise
-dd if=/dev/urandom bs=1M count=10 of=noise

speedtest.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
-
+set -euo pipefail
+if [ ! -f noise ]; then
+	dd if=/dev/urandom bs=1M count=10 of=noise 2>/dev/null
+fi
 size=$(du noise | awk '{ print $1 }')
 start=$(date +%s)
 ssh especificosba.com.ar "cat >/dev/null" < noise