sed command in unix

Sed is one of the most important editors in Unix, note that there is one. Support a variety of editing tasks, this article will implement the functional example of the topic Suppose we have a text file called Empfile that contains the employee name and employee ID, as follows: Hilesh, 1001Bharti, 1002Aparna, 1003Harshal, 1004Keyur, 1005 1. How to add a header line to a file through

matching row Sed '/hrwang/{n;s/my/your/;} ' datafile= Note: If you need to use more than one command, or if you need to embed an address within an address range, you must enclose the command in curly braces, write a single command per line, or separate multiple commands in the same row with semicolons. One y

UNIX|SED-------------+----------------------------------------------------------------cat|sed':'cat-s|sed'/./,/^$/!d'tac|sed'1!G;h;$!d'grep|sed'/patt/!d'grep-v|sed'/patt/d'head|

Use of the sed command, sed Sed streaming Editor/text filtering Stream Editor Based onPattern MatchingFilter/Modify text Syntax format: Sed 'edit directive 'file 1 file 2 All contents before and after modification are output. Sed

This article will show you how to read the contents of a file into the SED output and how to write part of a file to another file I. File Read It is assumed that there are two documents, File1 and File2, respectively, as follows: $ cat File11apple1banana1mango $ cat File22orange2strawberry SED has two options for reading and writing files R FileName: Reads the file contents specified by filenameW FileName:

'/^ $ /{N/^ $/D} 'FileThe function parameter N (refer to [section4.16]) adds the next row of blank rows to pattern space. Function parameter/^ $/D indicates that when a blank row is added, the first blank row is deleted, and the remaining blank rows are re-executed. Execute the command again and delete a blank row. The result is reversed until the blank row is added as a non-blank row. Therefore, only one blank row is output at the end of the consecu

character, you can replace a word is OK. 4. How to replace all the characters in the line, replace a with a $ sed ' s/a/a/g ' sample1.txtAppleOrAngeBAnAnAPappaya Note, just add a g option, g for global shorthand, is the global, all meaning. 5. How to replace the second occurrence of a? $ sed ' s/a/a/2 ' sample1.txtAppleOrangeBanAnaPappaya Not using G, but using numbers to represent the first occurrence

with quotation marks and a file name. Sed '/^ hrwang/\ > Hrwang and mjfan are husband \ > And wife 'datafile # If the row starting with hrwang is found in the datafile file, add hrwang and mjfan are husband wife to the row. 6.8 I \ command The I \ command inserts new text before the current line. 6.9 c \ command

appended, each row must end with a backslash, except for the last line. The last line ends with a quotation mark and a file name. sed‘/^hrwang/a\>hrwang and mjfan are husband\>and wife‘datafile#如果在datafile文件中发现匹配以hrwang开头的行，则在该行下面追加hrwang and mjfan are husband and wife 6.8 i\ CommandThe I\ command inserts a new text in front of the current line.6.9 c\ CommandSED uses this

existing text into new text. 6.10 n command Sed uses this command to get the next line of the input file and read it into the mode buffer. Any sed command will be applied to the next line followed by the matching line. sed