Tags: vim ascii shell 

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Here's a story how a CTF challenge was solved using $20. There are less expensive solutions (free), but, hey, this works and made us the 4th team to solve it of 8 total in a 1000+ competitor CTF.

https://www.eugenekolo.com/blog/hitcon-babyfirst-revenge-v2/

Original writeup (https://www.eugenekolo.com/blog/hitcon-babyfirst-revenge-v2/).