We have a html file like below Here’s the file we’re going to work with: cat geeks.txt We’ve numbered the lines to make this a bit easier to follow. ** Let’s take an example to understand it. , if I need to enter certain text before  like in the file, #sed -e ‘//i Welcome everybody’ test.html What can be a sed/perl line that can do it for me. How do I delete a matching line, the line above and the one below it, using sed? This is test page We can also insert new lines and text into our file. Add a line before the 4th line of the line. I have a C source code containing sql statements. If the file contains this text in any line then, ‘ PHP is an interpreted language’ will be inserted before that line. Add a line after a match. After that line I need to add Date of Joining (DOJ) Now this whole match gets replaced with \1\ninserted line\n, where \1 stands for the original content of the first match group, i.e. sed: Insert character in the beginning or end of line with matched pattern 1 thought on “sed: insert word or text after match in middle of the line (search and append a string before or after m… I found that insert line after match using sed is easy. If you want to change the file also, eval(ez_write_tag([[300,250],'techgoeasy_com-medrectangle-4','ezslot_6',109,'0','0']));we can do with -i option, #sed -i -e ‘//a  Welcome everybody’ test.html sed -n '/Conn. youfile.txt Check the difference in the examples above. You can add a new line after first matching line with the a command. In files, I have a field Date Of Birth (DOB). (5) I have the following sequence occurring multiple times in a file: yyyy xxxx zzzz. I prefer the first form because it's easier to add a new command by adding a new line and because the intent is clearer. Sed command “i” is used to insert a line before every line with the range or pattern. How to insert a line after finding a match in a string or a line is shown in this tutorial. youfile.txt The above example will append a line after the fourth line. Welcome everybody This is test page I was working on certain project last week where i need to insert line after match in 100 of files in Linux or Unix operating system. Thanks. Mickey This one-liner operates only on lines that match the regular expression /^$/. How to use sed to modify a line above or below matching pattern? 17. Unix & Linux: sed script to insert line after the last matching line in a fileHelpful? How can I use sed to do this? , I need to enter certain text after like in the file, sed -e ‘//a  Welcome everybody’ test.html After it ran, I checked some of my files, and this simple “sed insert after” example worked just fine. e.g. I figure the easiest way is to run a for loop to ssh to each box, sed the sudoers file to a new file & copy/move back over the top of the original (and of course, change permissions accordingly) Last Activity: 1 January 2021, 1:47 AM EST. 0152364|134444|10.20.30.40|015236433 6. sed solution: A new line can be inserted after any string value using the “sed” command if the pattern defined in the command matches with any part of the string value. One of the useful and powerful commands of Linux is the “sed” command. This makes the sed command a two line command. One of the useful and powerful commands of Linux is the “sed” command. I have a regex that matches xxxx. I found that insert line after match using sed is easy. I am doing in a... Sed: printing lines AFTER pattern matching EXCLUDING the line containing the pattern, Replacing lines matching a multi-line pattern (sed/perl/awk), sed - combination of line deletion and pattern matching. I'm assuming the best way to do this is with an inline sed search and replace or search and insert. DOB:19-Apr-1981 online xx:wer:xcv: sdf:/asdf/http:https-asdfd It was quite  successful for me ,so i thought i will share this on my blog. That sed example demonstrates how to insert text after a given line in a text file. Insert a line in a File. Well, this is just the little we could cover about how to delete lines matching a specific pattern in a file using SED. DOJ:20-Jun-2005 Note that "i" will insert your new text BEFORE the line matching the pattern. There must not be a space after the "\". The above sed command will print the sql blocks based on the pattern "exec sql" & ";"... trying to use sed in finding a matching pattern in a file then deleting This is test page If there is a match in the line insert a line before the text The following `sed` command will search the text, ‘ PHP is platform-independent’ in the input.txt file that is created before. It was quite successful for me ,so i thought i will share this on my blog. , You can make these changes in multiple files using *  or giving pattern the file, sed -i -e ‘//a  Welcome everybody’ *.html, Hope you like this short article on sed. # # /etc/pam.d/common-password - password-related modules common to all services A ) with patterns it should be used in the following sequence occurring multiple times in file! Be inserted before that line, the line containing the pattern the end of the line matching the?! Above example will append a line after a line, the lines to make this a bit easier follow. 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