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Asked: 2026-05-22T19:48:30+00:00

IP_ADDR=192.168.1.128 printf ‘%02X’ ${IP_ADDR//./ }; echo Can some one explain how this simple oneliner

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IP_ADDR=192.168.1.128

printf '%02X' ${IP_ADDR//./ }; echo

Can some one explain how this simple oneliner converts IP_ADDR to hexadecimal format? I am banging my head trying to find some documentation about this behavior.

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1 Answer

  1. Editorial Team

    Shell Parameter Expansion

    $ IP_ADDR=192.168.1.128
$ echo ${IP_ADDR//./ }
192 168 1 128
$ printf '%02X' 192 168 1 128 ; echo
C0A80180
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