If your machine install the IGNITE software you can use print_manifest , If not you can use cstm (Command line interface to the Support Tool Manager)
$ echo “selclass qualifier system;info;wait;infolog” | /usr/sbin/cstm | grep “System Serial Number”
System Serial Number…….: S**xxxxxx

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addthis_title = ‘Show+Serial+Number+System+In+HP-UX’;
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