Editing Comparison of command shells (section)

=== Text highlighting ===
The command line processors in [[DOS Plus]]<!-- COMMAND.COM/DOSPLUS.COM -->, <!-- TBD: possibly also some versions of Concurrent DOS -->[[Multiuser DOS]]<!-- TMP.EXE -->, [[REAL/32]] and in all versions of [[DR-DOS]]<!-- COMMAND.COM/DRDOS.COM --> support a number of optional environment variables to define escape sequences allowing to control text highlighting, reversion or colorization for display or print purposes in commands like [[TYPE (DOS command)|TYPE]]. All mentioned command line processors support <code>[[%$ON%]]</code> and <code>[[%$OFF%]]</code>. If defined, these sequences will be emitted before and after filenames. A typical sequence for {{code|%$ON%}} would be {{code|\033[1m}} in conjunction with [[ANSI.SYS]], {{code|\033p}} for an [[ASCII]] terminal or {{code|\016}} for an IBM or [[ESC/P]] printer. Likewise, typical sequences for {{code|%$OFF%}} would be {{code|\033[0m}}, {{code|\033q}}, {{code|\024}}, respectively. The variables <code>[[%$HEADER%]]</code> and <code>[[%$FOOTER%]]</code> are only supported by COMMAND.COM in DR-DOS 7.02 and higher to define sequences emitted before and after text blocks in order to control text highlighting, pagination or other formatting options.
<!-- TBD. Other command-line processors may provide similar features. -->

For the Unix/Linux shells, this is a feature of the terminal.