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An easy way to check certificate dates derived from the script from the

SSL Test Script Post

.

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  1 #!/bin/bash
  2
  3 # OpenSSL requires a port specification; default to 443.
  4 SERVER="$1:443"
  5 SERVER_HOST=$(echo "$SERVER" | cut -d ":" -f 1)
  6 SERVER_PORT=$(echo "$SERVER" | cut -d ":" -f 2)
  7 if [[ -z "$SERVER_HOST" || -z "$SERVER_PORT" ]]; then
  8   echo "Usage: $0 host[:port]"
  9   echo "    Default Port is 443"
 10   echo "Using: $(openssl version)"
 11   exit
 12 fi
 13 SERVER="$SERVER_HOST:$SERVER_PORT"
 14 SCLIENT_DUMP=$(echo "" | openssl s_client -connect "$SERVER" 2>&1)
 15 echo "$SCLIENT_DUMP" | openssl x509 -noout -dates
 16