/ {curly brackets ftw}

scr/4_acmesh.sh

@@ -12,7 +12,7 @@ fi
 this_file_name=`basename "$0"`
 
 if [ $# -ne 1 ]; then
-    echo usage: $this_file_name [E-MAIL]
+    echo usage: ${this_file_name} [E-MAIL]
     exit 1
 fi
 
@@ -25,7 +25,7 @@ apt -y install git-core bc
 cd /tmp/
 git clone https://github.com/acmesh-official/acme.sh.git
 cd acme.sh/
-./acme.sh --install -m $email
+./acme.sh --install -m ${email}
 
 # ---
 # manual steps