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https://codeshare.io/eV #!/bin/bash if [ $# -ne 2 ]; then echo "Usage: $0 <host_ip> <port>" exit 3 # NRPE Critical status code fi host_ip="$1" port="$2" timeout 3 /bin/bash -c "</dev/tcp/${host_ip}/${port}" &>/dev/null if [ $? -eq 0 ]; then echo "OK: Port ${port} is open on ${host_ip}" exit 0 # NRPE OK status code else echo "CRITICAL: Port ${port} is closed on ${host_ip}" exit 2 # NRPE Critical status code fi