grep case insensitive code example

Example 1: grep insensitive

With -i flag you can grep a substring with insensitive-case:
grep -i "substring_with_lower_or_upper_case"

Example 2: case insensitive grep windows

Find strings with case-insensitive search using -i flag with findstr as follows:
findstr -i "Case_insensitive_substring"
For example:
dir | findstr -i "Case_insensitive_file_name"