How can I write Shell script for default parameter setting

Question

In shell script, How can I set 0 as default value to parameter. param2=0 ${2:-0} and ${2:-param2} These result is 0: not found and param=$5 S{1:-$param} is active. but $0 mean shell script name. I want to use number 0. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

echo "param: $param" # param is not defined echo "param: ${param-0}" # use 0 as default param=99 # set a value for param echo "param: ${param-0}" # ignore the default output: param: param: 0 param: 99