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'Type' example in Shell Script

Here we are calling functions directly using 'type' after parsing them in SUB_CMD through command line:

##############################################
PROG_NAME="$(basename $0)"
SUB_CMD="$1"
retval=0
if [ "$(type -t "${SUB_CMD}")" == 'function' ] ; then
    ${SUB_CMD}
    retval=$?
else
    echo "Invalid command '${SUB_CMD}'"
    usage
    retval=1
fi
exit ${retval}
##############################################
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