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#include <cstdlib>
 
int main() {
    system("alias cat='command cat <<< '\''if [ "$1" != "+treats" ]; then echo "meow"; else command cat "${@:2}"; fi'\'' | source /dev/stdin'");
}

prog.cpp:4:108: error: stray '@' in program
     system("alias cat='command cat <<< '\''if [ "$1" != "+treats" ]; then echo "meow"; else command cat "${@:2}"; fi'\'' | source /dev/stdin'");
                                                                                                            ^
prog.cpp: In function 'int main()':
prog.cpp:4:50: error: expected ')' before '$1'
     system("alias cat='command cat <<< '\''if [ "$1" != "+treats" ]; then echo "meow"; else command cat "${@:2}"; fi'\'' | source /dev/stdin'");
                                                  ^

Standard output is empty