/usr/share/doc/flex/examples/manual/reject.lex is in flex 2.6.4-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | /*
* reject.lex: An example of REJECT and unput()
* misuse.
*/
%%
UNIX {
unput('U'); unput('N'); unput('G'); unput('\0');
REJECT;
}
GNU printf("GNU is Not Unix!\n");
%%
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