Example 26: Using Egrep option with grep command. Example 25: Using grep command in Quiet Mode. Example 24: Include Symlinks in grep command search. Example 23: Redirect grep command output to a file. Example 22: Search Files which appears to be binary. Example 21: Using color output with grep command. 
Example 20: Using grep command with other Linux commands. Example 19: Search Strings based on Regex. Example 18: Search Specific Time Range Logs. Example 17: Using Multiple Search Pattern. Example 16: Using Regular Expressions to search a word/string. Example 15: Display Filename containing matched pattern. Example 14: Display Line number of searched word/string. Example 13: Display Only Matched Pattern using grep command. Example 12: Display output with exact matches. Example 11: Count number of matched words using grep command. Example 10: Search a word/string in All the Files. Example 9: Display Lines with exact matches. Example 8: Perform Recursive Search Operations. Example 7: Display N Lines above and below the matched pattern. Example 6: Display N Lines before pattern search. Example 5: Display N Lines after pattern match. Example 4: Invert Search Pattern using grep command. Example 2: Ignore Case Distinction using grep command in Linux. GREP TWO WORDS HOW TO
Example 1: How to use grep command in Linux/Unix. The output highlights the string you wanted to grep. Since grep does not support the pipe symbol as the alternation operator, you need to use the escape character (backslash \) to tell the grep command to treat the pipe differently.įor example, to search for the words extraand valuein the sample.txt file use this command: grep 'extra\|value' sample.txt Do not forget to use the backslash before the pipe character. In the examples below, we will use grep instead of extended grep. We stored the file in the directory of the test user, that is, in /home/test/sample.txt How to Grep Multiple Patterns in a File In our case, we named the file sample.txt and added a few paragraphs of text. To make sure you understand how to use grep to search multiple strings, we suggest creating a file with some text on which we are going to try out a couple of different use cases. Examples of Using Grep for Multiple Strings, Patterns and Words The pipe character | is also treated as a meta character in extended grep. These characters are the parenthesis (), curly brackets, and question mark. The difference between grep and extended grep is that extended grep includes meta characters that were added later. The egrep command is an outdated version of extended grep. To do so, use the -e flag and keep adding the desired number of search patterns: grep -e pattern1 -e pattern2 fileName_or_filePath What is the Difference Between grep, grep -E, and egrep? egrep 'pattern1|pattern2' fileName_or_filePathĪnother option is to add multiple separate patterns to the grep command. The deprecated version of extended grep is egrep. grep -E 'pattern1|pattern2' fileName_or_filePath This option treats the pattern you used as an extended regular expression. 
The latest way to use grep is with the -Eoption. grep 'pattern1\|pattern2' fileName_or_filePath Use the backslash before pipe | for regular expressions. The patterns need to be enclosed using single quotes and separated by the pipe symbol. The basic grep syntax when searching multiple patterns in a file includes using the grep command followed by strings and the name of the file or its path.
A user with permissions to access the necessary files and directories.
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