Bash: What is the "prompt string"? How do you change it?

What is the "environment"? How does one process pass it to the next?

What does system("/bin/bash") do? What else can we substitute instead of "/bin/bash"? Why do exploit[34].c run system("/bin/bash") at the end of main()?

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Bash prompt strings marks the bash command line.
It can be changed by changing the content of PS1 “environment variable”. PS stands for “prompt string” (no coincidence here).
We can change that value by editing the .bashrc file and assigning another value to the variable PS1 in that file....

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