root@moscow-battle:~# echo $SHELL
/bin/bash
root@moscow-battle:~#
root@moscow-battle:~# help pushd
pushd: pushd [-n] [+N | -N | dir]
Add directories to stack.
root@moscow-battle:~# apt search pushd
Sorting... Done
Full Text Search... Done
libfile-pushd-perl/stable,stable 1.016-1 all
module for changing directory temporarily for a limited scope
pushd: not found
сам скрипт писал и соответственно команду.