редактор потока (stream editor)
Смотри также (See also)
awk(1p), ed(1p), grep(1p)
The Base Definitions volume of POSIX.1‐2017, Table 5-1, Escape
Sequences and Associated Actions, Chapter 8, Environment
Variables, Section 9.3, Basic Regular Expressions, Section 12.2,
Utility Syntax Guidelines
