![]() ![]() This worked for me in grep version 9.0.5 build 1989. Then the trick to make grep display the filenames \dev\nullĪnd finally, write the output in file with tee outputfile.txt "init time"), and you want to have the "init time" of each file, but knowing which file it belongs to. logsapp1, /logsapp2).Įach file has a pattern you want to grep (e.g. filename=logfile.DATE), inside several directories with a pattern (e.g. You want to find several files, lets say logs with different names but a pattern (e.g. $ egrep 'Manager|Developer' employee.How about this, which I managed to achieve thanks, in part, to this post. You can also combine NOT with other operator to get some powerful combinations.įor example, the following will display either Manager or Developer (bot ignore Sales). grep -v 'pattern1' filenameįor example, display all the lines except those that contains the keyword “Sales”. i.e It matches all the lines except the given pattern. Using grep -v you can simulate the NOT conditions. $ grep Manager employee.txt | grep Salesĥ00 Randy Manager Sales $6,000 Grep NOT 7. The following example will grep all the lines that contain both “Manager” and “Sales” in the same line. grep -E 'pattern1' filename | grep -E 'pattern2' You can also use multiple grep command separated by pipe to simulate AND scenario. Note: Using regular expressions in grep is very powerful if you know how to use it effectively. $ grep -E 'Manager.*Sales|Sales.*Manager' employee.txt ![]() The following example will grep all the lines that contain both “Manager” and “Sales” in it (in any order). Yes xargs -0 was the only constructive thing you pointed. The question is how to use cat from the out put of find command to print the content of the file not how to use sudo or find, The above command solves the question. The following example will grep all the lines that contain both “Dev” and “Tech” in it (in the same order). The OP wants to use cat to print the file content on stdout. ![]() ![]() But, you can simulate AND using grep -E option. $ grep -e Tech -e Sales employee.txtĥ00 Randy Manager Sales $6,000 Grep AND 5. for file manipulation about 398 cat command 398 cp command 399 head command 399. Use multiple -e option with grep for the multiple OR patterns. help obtaining 222 here documents 279, 280 heredocs strings 282 using. grep -e pattern1 -e pattern2 filenameįor example, grep either Tech or Sales from the employee.txt file. Use multiple -e option in a single command to use multiple patterns for the or condition. Using grep -e option you can pass only one parameter. $ egrep 'Tech|Sales' employee.txtĥ00 Randy Manager Sales $6,000 4. Just use the | to separate multiple OR patterns. egrep 'pattern1|pattern2' filenameįor example, grep either Tech or Sales from the employee.txt file. So, use egrep (without any option) and separate multiple patterns for the or condition. Grep OR Using egrepĮgrep is exactly same as ‘grep -E’. $ grep -E 'Tech|Sales' employee.txtĥ00 Randy Manager Sales $6,000 3. If you use the grep command with -E option, you just need to use | to separate multiple patterns for the or condition.įor example, grep either Tech or Sales from the employee.txt file. $ grep 'Tech\|Sales' employee.txtĥ00 Randy Manager Sales $6,000 2. Without the back slash in front of the pipe, the following will not work. grep 'pattern1\|pattern2' filenameįor example, grep either Tech or Sales from the employee.txt file. If you use the grep command without any option, you need to use \| to separate multiple patterns for the or condition. So: show the 'Status' line together with the next one (the 'Type' one), and then show the 'Type' line together with the previous one. The -B y means 'also show the y lines B efore the found one. The -A x means 'also show the x lines A fter the found one. I prefer method number 3 mentioned below for grep OR operator. I did it as follows: grep -A 1 '.Status.True' test.txt grep -B 1 'Type.Master'. Use any one of the following 4 methods for grep OR. You already knew that grep is extremely powerful based on these grep command examples. The following employee.txt file is used in the following examples. The examples mentioned below will help you to understand how to use OR, AND and NOT in Linux grep command. But, you can simulate AND using patterns. Question: Can you explain how to use OR, AND and NOT operators in Unix grep command with some examples?Īnswer: In grep, we have options equivalent to OR and NOT operators. ![]()
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