The tool's -f command line option allows you to do this.įor example, suppose you want to search for the words “how” and “to” in all. If necessary, you can also use the grep command to get the pattern from the file. #Grep filename only how to12 how to make grep get the pattern from the file So, for example, if you have a bash script with a loop and want to get a match in each loop iteration, then using 'grep -m1' is sufficient. This enables a calling process to resume a search. If the input is standard input from a regular file, and NUM matching lines are output, grep ensuresthat the standard input is positioned to just after the last matching line before exiting, regardless of the presence of trailing context lines. Therefore, to do this, you can run the following command:Ĭontinue, this is what the man page for the command shows: However, grep is required to stop searching after finding 3 lines containing the search pattern. For example, suppose you want to search the testfile1.txt for the word “how” containing the following line: If you want to limit grep output to a specific number of lines, you can use the '-m' command line option to complete. When you use the -e command line option, the command will understand what you are trying to search for in this case:ġ1 How to limit grep output to a specific number of lines For example, if you want to search for “-how”, the following command will not help: The “-e” command line option can also help if the pattern starts with a hyphen (-). In this case, you should use the '-e' command line option provided by grep.įor example, suppose you want to search for the words “how”, “to”, and “forge” in all text files that exist in the current working directory, then you can do the following: In some cases, you may want to search for multiple patterns in a given file (or set of files). 10 How to make grep command handle multiple search modes
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