treat case of empty argument

diff --git a/thresholds/split_thresholds.sh b/thresholds/split_thresholds.sh
index 023324a4db2712681ba9f87c7df0a9ab98ecb30d..41a102ce75cd86e5b6407e9888d555ba76eb8a12 100755 (executable)
--- a/thresholds/split_thresholds.sh
+++ b/thresholds/split_thresholds.sh
@@ -1,3 +1,8 @@
+if test -z "$1"; then
+    echo "usage: ./split_thresholds.sh  filename"
+    exit
+fi
+
 grep "endpoint: 0x2000, chain: 00" $1  > mcp00.log
 grep "endpoint: 0x2000, chain: 01" $1 >> mcp00.log
 grep "endpoint: 0x2000, chain: 02" $1 >> mcp00.log