Sed ‘/pattern2/d’ file1 | sed ‘0,/^pattern2. Sed ‘/pattern2/d’ file1 | sed ‘/^pattern2.*/i \pattern1’ > file2 Works fine if I have only one occurrence but if I have more and wanted to insert also 0, it changedįurther parts of the file it should not. I was thinking to simply delete pattern2 and insert before pattern1. Version of the output, pattern1 can be present more than once but I only want to have pattern2 before However, both lines starting with spaceĪnd the one contains normal characters, space and an = character too (pattern1), the other one is aįixed one starting with space containing an : character, too (pattern2). The problem couldīe easily fixed if I can change two lines if they are inverse. I have a problem because of different versions of a program in the generated outputs. We will replace it with the actual content: $ Sed '/DATA>/ /))/'.
The word DATA in that file is a placeholder for a real content that we will store in another file called data. We will use the (r) and (d) flags to do the job. Suppose that we have a file that contains text with a placeholder, and we have another file that contains the data that will fill the placeholder on the other file. We inserted the content after the third line as expected.Īnd this is using a text pattern: $ sed '/test/r newfile' myfile You can define a line number or a text pattern for the text that you want to read. You can use the (r) flag to read data from a file. However, by using -n combined with the equal sign, the sed command displays the line number that contains matching.
BEST COMMAND LINE TEXT EDITOR LINUX INSTALL
Note: Fedora 22+ Users use DNF to install packages instead of yum. In this guide, you will find some details of the most favorite and useful command line text editors. You can print line number using the (=) sign like this: $ sed '=' myfile The Linux users and system administrators always prefer to use command line interface to work on it. The g flag means global, which means a global replacement for all occurrences: $ sed 's/test/another test/g' myfile
You can limit your replacement by specifying the occurrence number that should be replaced like this: $ sed 's/test/another test/2' myfileĪs you can see, we replaced only the second occurrence on each line. w file: means write the results to a file.A number, the occurrence number for the new text that you want to substitute.We can write the flags like this: s/pattern/replacement/flags To substitute all occurrences of a pattern, use one of the following substitution flags. In this tutorial, we are going to show you the most common command line text editors in Linux and show you their pros and cons, which helps you to choose the right editor.
The above result shows that we replaced the first occurrence in each line. Look at the following example carefully: $ cat myfile $ sed 's/test/another test/' myfile S/test/another test/ $ sed -f mycommands myfile You can save your sed commands in a file and use them by specifying the file using -f option.