ejemplo de código de coincidencia exacta grep

Ejemplo 1: grep no coincide

Just filter your output with:
grep -v "excluded_pattern"
Example to get all not txt files in current directory.
ls | grep -v .txt

Ejemplo 2: tercera coincidencia grep

#Combine grep and tail for grepping until second match and filtering 
#last with tail command
grep -m2 "two" in-file.txt | tail -n1

Ejemplo 3: primera coincidencia de grep

Just combine grep with head command for filtering  only the first match as:
grep "match" | head -n 1   #Change 1 to not only match first but further matches

Ejemplo 4: grep o coincidencia

$ grep "PATTERN1|PATTERN2" FILE
$ grep -E "PATTERN1|PATTERN2" FILE
$ grep -e PATTERN1 -e PATTERN2 FILE
$ egrep "PATTERN1|PATTERN2" FILE

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