Indent (Unix)

indent is a Unix utility that reformats C and C++ code in a user-defined indentation style and coding style. Support for C++ code is minimal.

The original version of indent was written by David Willcox at the University of Illinois in November 1976. It was incorporated into 4.1BSD in October 1982. GNU indent was first written by Jim Kingdon in 1989. The command is available as a separate package for Microsoft Windows as part of the UnxUtils collection of native Win32 ports of common GNU Unix-like utilities.

Examples of usage
The following command

indents  in a style resembling BSD/Allman style and writes the result to the standard output.

GNU indent
GNU indent is the GNU Project's version of indent. A different indentation style, the GNU style, is used by default.