Run
bash create_source_code_file.sh [filename].[language]
bash create_source_code_file.sh your_first_problem.cpp
For my convenience I've made an alias in ~/.bash_profile
to run this script
alias sol='bash /path/to/LeetCode/create_source_code_file.sh'
Things will be easier
sol today_leetcode_problem.cpp
You can make your own alias by adding the line to your ~/.bash_profile
alias [your_command_alias]='bash /path/to/this/repo/create_source_code_file.sh'