A tangible example: if you've got a script the likes of: #!/bin/bash echo 'Hi!' sleep 20 echo 'Hello!' ... and runt it ... and while the scr

A tangible example: if you've got a script the likes of: #!/bin/bash echo 'Hi!' sleep 20 echo 'Hello!' ... and runt it ... and while the script is executing the sleep line, modify it so that instead of 'echo "Hello!"' it does something else, like 'echo "Oops!"'... ... once it resumes from the sleep, it'll execute the updated code. Don't ask me how I know... I just wish it were more well-known. Don't modify shell scripts while they're running!