Sed Replace Last Line, Where is the error? Nov 14, 2012 · If hardcoding n is an option, you can use sequential calls to sed. May 17, 2020 · The pattern space now contains the original first portion of the line, and the hold space contains the last portion of the line. Useful non-substitution commands. Sep 14, 2016 · I am trying to replace the last character in a line with the same character plus a quotation mark ' This is the sed code but does not work. Useful one-liners. Aug 1, 2007 · Hello Sed Experts, I have got a file which contain entries as below pmNoOfSwDownHsCong, pmUlUpswitchAttemptHigh, pmUlUpswitchAttemptLow, pmUlUpswitchSuccessHigh, pmUlUpswitchSuccessLow, pmUpswitchFachHsAttempt, pmUpswitchFachHsSuccess, I want to replace the the comma "," in the last line with a space. Add or replace whole lines. Before that though, you can substitute the line matching a with whatever you desire. txt and then deleting the original line. Mar 6, 2017 · Replace last characters in each line Ask Question Asked 9 years, 4 months ago Modified 9 years, 4 months ago Jun 28, 2012 · You can use the change command to replace the entire line, and the -i flag to make the changes in-place. man sed, section Addresses can help you understand how to apply sed commands on part of the text. What would such a sed command look like? I imagine I would need to use a regular expression but am not sure how to start the pattern after the seventh comma. Use regex and capture groups. Select by position or pattern. . sed is a powerful Linux utility used to find, replace, add, or delete text from input streams. Oct 27, 2017 · A fun way to do this, is to use rev to reverse the characters of each line and write your sed replacement backwards. G appends the hold space to the end of the pattern space with a newline character in-between. Dec 3, 2025 · In this blog, we’ll dive deep into using regular expressions (regex) with sed to target and replace the last occurrence of a string in each line. Jun 15, 2013 · The last line matching a would not be able to get its all content printed, so you manually print it out in the END block. Sed - Replace last occurrence of match for each line Ask Question Asked 12 years, 3 months ago Modified 7 years, 5 months ago Jan 14, 2024 · Finally, we saw two real examples of using sed to detect and manipulate text at the end of a line. Feb 4, 2026 · Control output and remove lines. Jun 11, 2024 · This tutorial explains how to use sed to replace the last lint matching a pattern in a file, including an example. Aug 26, 2010 · This will perform substitution only on last line (because of $), replacing line number by nothing. In your case, it's added by echo which always adds one unless you use the -n option (with some implementations), or add a \c (with others, the standard ones, not the case of yours which seems to supports that non-standard -e). We’ll cover the underlying regex logic, step-by-step examples, edge cases, and real-world scenarios to ensure you can apply this technique confidently. Can you please help me with this in sed Thanks a lot in advance Mohammed Oct 11, 2022 · The last character in a text file is a newline character, the delimiter of the last line. For instance, to delete the last three lines, delete the last one line thrice: Sep 17, 2012 · However, I'm not sure how to construct a sed command to locate the seventh comma and replace the remaining string to the end of the line with a fixed string. The first y/// command replaces all remaining | with spaces. Dec 27, 2023 · This is where the ability to precisely replace just the last text match comes in very handy! Over the next few sections, let me walk you through fail-proof techniques to master this editing finesse in sed. You probably meant "how to remove the last character of the last line of the May 25, 2021 · Deletes all but the last line number outputted by the first step (using $!d, "if this is not the last line, delete it"), and creates a two-line sed script that would modify the last matching line by first reading sample1. Write changes back to files. If you are comfortable with hold space, using don_crissti's approach gives additional opportunity to preserve anything from the existing line and its position as well. For example, using GNU sed: Mar 3, 2015 · How do I replace the last occurrence of a character in a string using sed? Ask Question Asked 11 years, 5 months ago Modified 8 years, 4 months ago Oct 30, 2015 · Here is a simpler sed approach, as I don't find sed hold space easy to work with. hpjzd4ma, ljh6, gq3oaf, eq, jxsqn, wrv, ib0zf, vvwm3om, ysbji, otgluj8,