The following command will switch the pair of words in each line of the file, course. The following command will print the content of os. There are four lines in os. So, the line number is printed before each line of the file. The sed command has a number of different uses. That being said, the main usage is for substituting words in a file, or finding and replacing. The great thing about sed is that you can search for a word in a file and replace it, but you never even have to open the file — sed just does it all for you!
As well as this, it can be used for deletion. All you need to do is type the word you want to find, replace or delete into sed, and it brings it up for you — you can then choose to replace that word or delete all traces of the word from your file. After typing the S you can replace or substitute anything you wish — just typing S will only replace the first occurrence of the word on a line. Therefore, if you have a sentence or line that mentions it more than once, the S function is not ideal as it will only substitute the first occurrence.
You can specify a pattern to make S replace words every two occurrences as well. Specifying G at the end of the sed command will do a global replacement that is what the G stands for. With this in mind, if you specify G it will replace every occurrence of the word you have chosen, rather than just the first occurrence that the S does.
You can run a sed script in a number of ways but the most common is on the command line. Here you can just specify sed and the file you want to use the command on. You can also use it in a shell script, and this way you can pass whatever you want to the script, and it will run the find and replace command for you.
This is useful for not wanting to specify highly sensitive data inside a script, so instead, you can pass it in as a variable. Bear in mind that this is of course only available on Linux, and so you will need to ensure you have a Linux command line in order to run your sed script.
I am a trainer of web programming courses. I like to write article or tutorial on various IT topics. But this commands performs all types of modification temporarily and the original file content is not changed by default.
The user can store the modified content into another file if needs. By using SED you can edit files even without opening them, which is much quicker way to find and replace something in file, than first opening that file in VI Editor and then changing it.
SED is a powerful text stream editor. Can do insertion, deletion, search and replace substitution. SED command in unix supports regular expression which allows it perform complex pattern matching.
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