From cb7c34e5614be8f0220e6bb8bea5eedb22b81ab5 Mon Sep 17 00:00:00 2001
From: Luke Bratch <luke@bratch.co.uk>
Date: Tue, 11 Jul 2023 14:34:53 +0100
Subject: Use $((FOO - BAR)) instead of $(("$FOO" - "$BAR"))

---
 certexpiry.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/certexpiry.sh b/certexpiry.sh
index 468e4e0..7b02818 100755
--- a/certexpiry.sh
+++ b/certexpiry.sh
@@ -126,11 +126,11 @@ while read -r HOSTANDPORT ; do
 #  echo "DEBUG: EXPIRY6: $EXPIRY6."
 
   # Number of seconds left (IPv4)
-  DIFFERENCE4=$(("$EXPIRY4" - "$NOW"))
+  DIFFERENCE4=$((EXPIRY4 - NOW))
 #  echo "DEBUG: DIFFERENCE4: $DIFFERENCE4."
 
   # Number of seconds left (IPv6)
-  DIFFERENCE6=$(("$EXPIRY6" - "$NOW"))
+  DIFFERENCE6=$((EXPIRY6 - NOW))
 #  echo "DEBUG: DIFFERENCE6: $DIFFERENCE6."
 
   # Warn if less than WARNSECONDS less (IPv4)
-- 
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