Find specified text within one or more files. More information: https://learn.microsoft.com/windows-server/administration/windows-commands/findstr.
findstr "{{string1 string2 ...}}" *
{{dir}} | findstr "{{string1 string2 ...}}"
findstr /s "{{string1 string2 ...}}" *
findstr /i "{{string1 string2 ...}}" *
findstr /r "{{expression}}" *
findstr /c:"{{string1 string2 ...}}" *.txt
findstr /n "{{string1 string2 ...}}" *
findstr /m "{{string1 string2 ...}}" *