The sed command in Linux is a powerful stream editor used to filter, find, and modify text within files or input streams.
Short for “stream editor,” sed operates line-by-line and can perform operations like search-and-replace, deletion, insertion, or even complex pattern matching using regular expressions. It is commonly used for parsing and transforming text in automation scripts or when editing files without opening a text editor.
In the screenshot, the user first creates a file called newfile.txt containing the sentence “This is an error” using the echo command. They confirm the file’s contents with cat newfile.txt.
Next, the command sed 's/error/OK/' newfile.txt is used to display the modified version of the file where “error” is replaced with “OK” — but it does not actually change the file. To apply the change permanently, the user runs sed -i 's/error/OK/' newfile.txt, where -i stands for “in-place,” meaning the file is directly updated.
Running cat newfile.txt afterward confirms the change has been saved. This sequence demonstrates both the power of sed as a tool for temporary text transformation and how to make those changes persistent in Linux.
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