GREP FOR MULTIPLE STRINGS HOW TO
We can also search the files using grep command lets see how to search files. Search for files which are matching to the given string To count the matched string we have to use -c option. Get the count of given string from single file / multiple files Which basically highlights the matched pattern with foreground color black and background color yellow (shown below in the snap).Ĥ7 White 10. If you want to set this option as permanent we have to set the environment variable grep]# export GREP_COLOR='1 30 42' grep]# grep -color=auto CHARACTERS demofile We can use –color option to see the string in color, as a temporary. So how we can set the grep highlight color lets see If we see searched string in will show in highlighted color it will be most effective view we can see. Most of the times we search for matching strings but we have see in detailed that where is matched string is. grep command the string with highlighted in color See the below example to understand the recursive search. To search all the sub-directories we have to use -r flag. Search Recursively all the sub-directories
Second line is this <-its Above line 1īelow second line in this grep demo <-its Below line 1Ĩ. See the below example grepping for the word ‘ALL’ and mentioned number of lines after -C option it print its above and its below line. To print matching string and its around lines we have to use -C option. Print the matching string and its around number of lines See the below example grepping the word ‘below’ and mentioned number of lines after -B option it prints before number of lines. Print the string and its before number of lines, we have to use -B option. Print the matching string and its before number of lines See the below example grepping the word ‘ below‘ and mentioned number of lines after -A options it prints after immediate lines. String and its after number of lines, we have to use -A option. Print the matching string and its after number of lines Last line of the grep grep]# grep -v -e "First" -e "last" demofileĥ. see the other below example where we are excluding the ‘ First‘ and ‘ last‘ strings. You can also use multiple strings using -e option. As a example below it is excluded “First” line from the search. Search text which is not matching to stringīelow option is useful when your searching for the exclude matching word. So it matches all the words such as “first”, “FIRST” and “First” case insensitively as shown below. To grep text as case insensitive we have to use -i option. Case insensitive word using grep -i (ignore case sensitive) grep]# grep first grep]# grep First demofileįirst line in the grep demo 3. See the below example when searched with ‘ first‘ word it does find matching in the file but when we search with ‘ First‘ it find matching. To grep text using grep command as case sensitive no need to use any options, default grep will search the text as case sensitive. Search word in single/multiple files case sensitive To check its version in all the OS grep -V 2. In Ubuntu Operating system dpkg -l |grep grep
Red hat / Centos / Fedora use below command rpm -qa |grep grep Check grep command installed.? and its version The demo files contains below lines grep]# cat demofile -o : Print only the matched parts of a matching line, with each such part on a separate output line.įirst I am going to create an file to explain how grep works.-E : Extended regular expressions or egrep.-f file : Takes patterns from file, one per line.-v : Ignore the pattern and match except.-n : Pattern matches lines and their line numbers.-i : Ignore Upper case or Lower case (Non-case sensitive).-c : Print only count which matches the pattern.Search for required text content out of big text files is hectic task. Practical Grep command Tricks will help you to search millions of records. This article will discuss how you can use the grep command effectively to find multiple strings.We can grep the text as required, searching with particular string, printing lines before and after the search string. By having this command, you will save considerable time and avoid having to perform this task manually. This is super effective, especially if you are simultaneously dealing with tons of different files and looking for specific information. The grep command is used to find the information in any file or directory you are looking for.
0 kommentar(er)
