Article shows how to make a script that fakes one kind of content when printed with cat, but uses different code when executed:

$ printf '#!/bin/bash\necho doing something evil!\nexit\n\033[2Aecho doing something very nice!\n' > backdoor.sh

$ chmod +x backdoor.sh

$ cat backdoor.sh
#!/bin/bash
echo doing something very nice!

$ ./backdoor.sh
doing something evil!

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