exit with positive and negative 18/19 digits
check error codes
Export multiple variables
./tester os_specific



Open file descriptor with cat << eof | ls open fd and infinte loop
Cat makefile | (echo yes && rev) leaks
echo yes && echo yes && car dhdgdgjsk || echo no leaks
echo abc && echo def | cat | rev && echo yes
(), ((())), (())
export leaks

fix broken tests from tester


To test:


ctrl backslash in middle of line
ctrl c on character we are ln with cursor, not end of line

test signals
test and verify all malocs
verify forbidden functions
check for any hidden or useless files