![]() ![]() In our situation, we gave the file the name sample.txt and then added some content. ![]() We advise generating a file with some text on which we will test out a few different use cases in order to ensure that you comprehend how to use grep to search multiple strings. Examples of Multiple String, Pattern, and Word Grep Searches In extended grep, the pipe character | is also considered as a metacharacter. The question mark, curly brackets, and parenthesis are these symbols. It performs the same task as grep -E.Įxtended grep contains meta characters that were added later compared to regular grep, which does not. What is the Difference Between grep, grep -E, and egrep?Įxtended grep has been superseded by the outmoded grep command. pattern1 and pattern2 in grep fileName or filePath.How to Grep for Multiple Strings, Patterns, or Words? Use the -e flag and keep adding the required amount of search patterns to do this: fileName or filePath egrep 'pattern1|pattern2'Īnother choice is to use the grep command with numerous independent patterns.grep -E "fileName or filePath" "pattern1|pattern2"Įxtended grep’s obsolete counterpart is egrep.With this selection, the pattern you selected is treated as an extended regular expression. The -E option is the most recent way to use grep. fileName or filePath grep 'pattern1|pattern2'.To use regular expressions, place a backslash before pipe |. The patterns must be separated by the pipe symbol and enclosed in single quotes. When looking for numerous patterns in a file, the basic grep syntax entails using the grep command, strings, and the file’s name or path. Search Recursively for Multiple Patterns in a File.Grep for Multiple Patterns in a Specific File Type.When using Grep for several strings, ignoring the case.How to Grep Multiple Patterns in a File.Examples of Multiple String, Pattern, and Word Grep Searches.What is the Difference Between grep, grep -E, and egrep?. ![]() If you are looking for a Linux Developer job, check Jooble! Resourcesįull Text of Harrison Bergeron by Kurt Vonnegut, Jr. ![]() If you know of an different method feel free to post them in the comments. They all achieved the same results, but done in a different way. Here we examined three different ways to grep multiple strings from a file, pattern matching, basic regular expression and extended regular expressions. Some people find certain ways easier to remember, or just more efficient. There are always several ways to accomplish the same task in Linux. You can set an alias for grep to egrep for convenience. In extended regexp we do not need to escape the pipe because it is supported as an OR operator. Or, we can use egrep: egrep 'Pattern1|Pattern2' filename We can use the extended regexp by using the -E option with grep. grep 'motion\|winced' HarBerg.txt Using Extended Regular Expressions to Grep Multiple StringsĮxtended Regular Expressions support the OR operator. Here we will use the same patterns and text file as above, but using the basic regular expressions syntax. grep 'Pattern1\|Pattern2' filenameīasic regexp do not support the pipe ( | ) as an OR operator, so we have to escape it with a backslash. Here is an example of using basic regular expressions to find two strings in a file using grep. The grep command supports both basic and extended regular expressions. grep -e "winced" -e "motion" HarBerg.txt Using Basic Regular Expressions to Grep Multiple Strings Here is an example of searching for the word winced, and the word motion, in the text of the Harrison Bergeron short story that is saved as HarBerg.txt. You can specify several patterns by using the -e switch. Using Pattern Matching to Grep Multiple Strings This is not meant to be a regex primer, but they are an important tool for matching several patterns. Here we will discuss pattern matching, basic regular expressions and extended regular expression. As with everything in Linux, there are several ways to accomplish the same task. There are several ways you can match multiple strings or patterns from a file using grep. ![]()
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