You will have to remove those if your input contains more than just the addresses. Note however that some of the expressions are used to match only the IP address and therefore contain beginning- ( ^) and end-of-line ( $) characters. Any line starting with 1921 will be matched, and only the matching. You can find lots of IP address regular expressions on the web, see for example this StackOverflow question. Only 1921 will be matched, and only the matching part will be printed because of the -o switch.Also, specify the name of the file that contains the text. grep -o 192.1.* zĪny line starting with 1921 will be matched, and only the matching part will be printed because of the -o switch.* matches anything up to the end of the line, including the empty string. Find Text in Files To search for text pattern in a file, simply run grep followed by the pattern name. Only 1921 will be matched, and only the matching part will be printed because of the -o switch. Your input does not contain data where this makes any difference. will be matched, and only the matching part will be printed because of the -o switch. Following picture show the example for the line numbers.Why your commands are (not) working: 1. This will help user to go the line when user open the file in vi editer to know nearby logs.
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