Add ping cmd check

1 files changed, 6 insertions, 0 deletions

diff --git a/ping-he-tb b/ping-he-tb
index b87f8b2..4ef0dd9 100755
--- a/ping-he-tb
+++ b/ping-he-tb
@@ -34,6 +34,12 @@ main () {
 	done | sort -g
 }
 
+which ping > /dev/null 2> /dev/null
+if [ $? -ne 0 ]; then
+	echo "ping not found." >&2
+	exit 1
+fi
+
 set -e
 TMPDIR=$(mktemp -d)
 set +e