search for a specific line in a .txt file saved on a SD Card

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hello guys!

i've got sd card attached arduino uno , on sd card there .txt file.
inside of .txt file there numbers written (one number per line).
i want compare value of integer, lines of .txt file, eg. search match.
and have no idea how approach this.  :~

thank help!  :)

step 1.  read each line file , display on serial monitor.


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