We aren’t doing the next generation of Linux and Unix admins any favors by forgetting init scripts and fundamental tools I happened across a post on Reddit by chance, asking about textfile ...

Unix utility SED provides an effective and versatile way of deleting one or more lines from a designated file to match the needs of the user. This Unix command is used for command line processing.

The filter sed can process text from standard input and write its results to standard output. The input can be redirected from a file, and the output also can be redirected to a file using your ...

A key point to these tools (from a practical point ) is that they are very memory efficient and allow work on just a "line".