binaries and interactive variables are readonly

evomaintenance.sh

@@ -349,7 +349,10 @@ USER=$(logname)
 PATH=${PATH}:/usr/sbin
 
 SENDMAIL_BIN=$(command -v sendmail)
+readonly SENDMAIL_BIN
+
 GIT_BIN=$(command -v git)
+readonly GIT_BIN
 
 GIT_REPOSITORIES="/etc /etc/bind"
 
@@ -374,6 +377,7 @@ if [ -t 0 ]; then
 else
     INTERACTIVE=0
 fi
+readonly INTERACTIVE
 
 if [ -z "${MESSAGE}" ] && [ "${INTERACTIVE}" = "1" ]; then
     # get input from stdin