Yes. $_ is documented here: https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Bash-Variables https://www.gnu.org/savannah-checkouts/gnu/bash/manu

Yes. $_ is documented here: https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Bash-Variables https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.... And !$ is documented here: https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Word-Designators https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash....