![]() You can also run the man command to check the grep command manual page for finding more options. The words that you searched are highlighted in red. You can see the output of this command in the given image. grep -color -i 'warning\|error\|critical' /var/log/syslog grep 'warning\|error\|critical' /var/log/syslogīy default search is case sensitive you can make it insensitive by using the option -i we also recommend using option -color to highlight these words. Here string1 and string2 will be two different texts that you are looking for in a specific file which is the filename in this case. ![]() grep -inRsH 'Text to be searched' /path/to/dir (it can be. Use option -w with the above command to display only lines that contains these words. This grep command will give you a precise result when you are searching for specific text on Linux. Now execute the given command to find these words – grep 'warning\|error\|critical' /var/log/syslog The grep command is primarily used to search a text or file for lines that contain a match to the specified words/strings. In our example, we will find the warning, error, and critical words in /var/log/syslog which is a log file that stores global system activity data. The strings are the most basic patterns that we use with the grep command. grep -E 'pattern1|pattern2|pattern3' file How to grep multiple strings in a Single Command When using this syntax do not use the escape sequence i.e. You can use option E with the grep command to interpret the pattern as the extended regular expression. grep 'pattern1 \|pattern2\|pattern3' file To search for multiple patterns with the basic regular expression syntax you can use the command as it is given below. egrep 'pattern1|pattern2' *.txtĪnother one is Perl compatible syntax you can try this on older Unix shells. Grep multiple strings in multiple files using single command 1 Shell Programming & Scripting Single grep to multiple strings with separate output per string. Next is the extended regular expression which is given below. The grep command supports three types of the regular expression. The pattern or sequence of character that you want to search using grep in one or more files is known as a regular expression. How to grep multiple Strings on a Linux or Unix system I just updated my Linux grep command examples, and it shows many other grep command examples that may also be helpful.For basic usage of this command, you can read the grep command in Linux. There may be better ways of doing this, but for today it worked as an okay solution to grep multiple patterns on many files, in many directories. Once it finds those files the find command prints the file names, and then the grep command at the beginning of the expression kicks in to find the string "jtable". This find/grep command begins inside the parentheses by first finding all files whose name ends with the characters "*.java,v" and also contains the string "prevayl". Enclose the string youre looking for in double quotation marks. name "*.java,v" -exec grep -li "prevayl" \ ) The simplest fundamental patterns are literal strings. I couldn't find a way to do this with a simple combination of the find and grep commands, but a friend suggested this grep/find command combination: ![]() ![]() grep multiple string patterns in many files By default with grep with have -e argument which is used to grep a particular PATTERN. That is, I wanted to be able to grep multiple patterns in multiple files. In my case the patterns I was looking for were the strings "prevayl" and "jtable". ![]() Linux grep FAQ: How can I use the Unix grep command to search for multiple patterns with one command?Ī little while ago I needed to search for all files in a CVS repository that contain multiple character patterns. ![]()
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