Sed creates or truncates the given filename before reads the first input line and it writes all the matches to a file without closing and re-opening the file. In this article, I will provide an example of how to insert a line before and after a match using sed, which is a common task for customizing configuration files. This sequence shall be going on until the end of the file. I have following file and I want to insert a line at 4th line as "This is my 4th line" The number of lines in between two cartesian coordinates are 7841. | Content (except music \u0026 images) licensed under CC BY-SA | Music: | Images: \u0026 others | With thanks to user Kamaraj (, user johnsnow (, and the Stack Exchange Network ( To make the changes within the same file # sed -i 's/$/ :SUFFIX &/' /tmp/file . We also have to group this in parenthesis. Inserting New Lines For example, to display the 10th line, you can use sed in the following manner: sed -n '10p' file.txt. I'm trying to get sed to add some text to the end of a line if that line contains a specific piece of text. What about using a range of lines: A pattern that matches a specific line. Programming :: How To Append A String To A Next Line In Perl. Programming :: How To Append Text To Second Line Of File? If I do:for i in $(cat names); do seq -f "$i%03.0f" 0 999; done > output5.txtI got ( tail snipped):997munt998munt999muntIf I do:for i in $(cat names); do seq -f "%03.0f$i" 0 999; done > output4.txtI got:997Zygmunt998Zygmunt999ZygmuntHow I can get numbers from 000 to 999 appended like:Zygmunt997Zygmunt998Zygmunt999. The awk command could seem complicated and there is surely a learning curve involved. 21. not like append the same string to each line. Regex patterns to match start of line Red Hat / Fedora :: Add A Comment To Specific Line With Sed. I believe its counterpart for the beginning of a line is “^” (up-pointing carat), but don’t quote me on that. Using sed and the pattern described: sed '/$/ myalias/' file. before, after, or between characters. Although there are multiple ways to append the text lines or data and command output to a file, we saw that the easiest way is using >> redirect character. Here is another way using awk. We next add the replacement text, in my case I want to sync with so we replace then line … b label You can use the a sed command to append … N = Line number p = print. ... › Append data to end of first line Both cases work perfect on Linux but fail on Solaris. You can use this to change as well as uncomment a line no matter how it is commented, with # or // or