What command would you use to delete a specific line from a file?

Using the sed command is the appropriate choice for deleting a specific line from a file because sed stands for "stream editor," and it allows for powerful text manipulation, including line deletion.

The basic syntax for deleting a specific line, such as line number 3, would be sed '3d' filename, where 3 indicates the line number you want to delete and d signifies the delete command. This command processes the file and outputs the result, providing a way to manipulate the content directly as needed. It’s particularly useful for editing files, as it can make modifications on-the-fly without permanently changing the original file unless you redirect the output or use the -i option for in-place editing.

The other commands hold different functionalities: rm is used for removing files or directories, sort organizes lines in a file alphabetically or numerically, and echo is primarily for displaying a line of text or variables. Each of these commands addresses different tasks rather than enabling specific line manipulation in a file.