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 first command we’ll examine in this post is a very unusual awk command that systematically removes every line in the file that is encountered more than once. It leaves the first instance of the ...

Linux provides many commands for examining the contents of files including cat, more, head and tail, but that’s just a start. For one thing, even the most obvious commands have a lot more options than ...