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Assuming your file is named test.csv:
test.csv
cat test.csv | grep -E "48[0-9]{3}" test.csv
grep -E search a string using a regexp 48
48 is the start number you need [0
[0-9] is a number between 0 and 9 and {3} means 3 times
grep -E search a string using a regexp 48 is the start number you need [0-9] is a number between 0 and 9 and {3} means 3 times
grep -E "48[0-9]{3}" test.csv
grep -E search a string using a regexp
48 is the start number you need
Assuming your file is named test.csv test.csv:
Assuming your file is named test.csv :
cat test.csv | grep -E "48[0-9]{3}"
