A little more sophisticated script than the former bash menu example to get some arguments from command line.

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#!/bin/bash
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while getopts "u:p:" opt; do
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  case $opt in
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    u)
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      echo "-u was triggered, Parameter: $OPTARG"
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      dbuser="$OPTARG"
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      ;;
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    p)
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      echo "-u was triggered, Parameter: $OPTARG"
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      dbpass="$OPTARG"
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      ;;
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    \?)
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      echo "-u was triggered, Parameter: $OPTARG"
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      exit 1
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      ;;
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    \?)
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      echo "-u was triggered, Parameter: $OPTARG"
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      exit 1
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      ;;
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  esac
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done
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# Clear all options and reset the command line
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shift $(( OPTIND -1 ))