So basically, I need help with listing lines with their line numbers that contain one or more words that start with 42 and end in a sequence of any number (but not zero) of character X.so far what I got is:ls | grep -En ^42 filenameIt just the end in a sequence of any number part that I don't understand.This is for bash by the way.
Listing lines that start with a number and end in a sequence
bash;grep
(some sequence of commands) | grep -E '^42.*X+$'Will search the output of the sequence of commands for lines matching the following criteria:^ - The beginning of the line42 - The numeral four followed by the numeral two.* - Any sequence of zero or more charactersX+ - Any sequence of one or more of the character X$ - The end of the lineThe following examples will match:42freebleXXXX42X42 partriges in 42 pear trees XThe following will not:42Xy42x52freebleX