bash if argument given code example

Example 1: if argument bash

if [ -z "$1" ]
  then
    echo "No argument supplied"
fi

if ["$1" ]
  then
    echo "Argument supplied is: "$1
fi

Example 2: bash if argument in file

if [ ! -z $1 ] #Check if argument for script is given
  then var=$1
  else var="argument_not_given"
fi