textproc/gsed 4.9p1 OpenBSD

GNU sed is the Free Software Foundation's version of the sed(1) editor.

GNU sed isn't really a true text editor or text processor. Instead, it is used to filter text, i.e., it takes text input and performs some operation (or set of operations) on it and outputs the modified text. Sed is typically used for extracting part of a file using pattern matching or substituting multiple occurrences of a string within a file.

The sed binary is prefixed with the letter g to differentiate it from the standard application with the same name.