/usr/share/doc/flex/examples/manual/user_act.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.
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#include <ctype.h>
void user_action(void);
#define YY_USER_ACTION user_action();
%}
%%
.* ECHO;
\n ECHO;
%%
void user_action(void)
{
int loop;
for(loop=0; loop<yyleng; loop++){
if(islower(yytext[loop])){
yytext[loop] = toupper(yytext[loop]);
}
}
}
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