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henix/hashport.sh

Created December 21, 2018 10:23
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Get a port number for you app. Usage: hashport.sh my-app
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hashport.sh
#!/bin/sh
[ $# -ne 1 ] && echo "Usage: $0 name" && exit 1
p=$(printf "%d" "0x$(printf "%s" "$1" | md5sum | head -c 4)")
# pratical port range is 1024 ~ 65535 (for app that don't require root)
# 64499 is the first prime number that less than 65535 - 1024
port=$((p % 64499 + 1024))
echo "$port"
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