[blackboar]

Definitely a case to use "strings <filename>" rather than 'cat <filename>'

Not really a hack, but if you downloaded a script/program and check it out using the unix command 'cat', be aware that folks can use certain characters to "hide" the code

So the idea: if they use "cat" instead of opening the file in vi or an editor then you can hide code, specifically a reverse shell or dumping the /etc/passwd file

****************

echo -e '#!/bin/sh\ncat /etc/password\nexit\n\033[A\033[Aecho "Hello dear reader, I am just a harmless script, safe to run me!"' >demo.sh

***********
So total click bait but still "kinda" accurate. Assuming I typed it correctly from the image I downloaded.

But when you cat "demo.sh" you only see the harmless bit.

$ cat demo.sh
#!/bin/sh
echo "Hello dear reader, I am just a harmless script, safe to run me!"