how to use `amp;` & `gt;` commands in linux-shell?
& and > are html escape codes for & and > respectively.
Either you have downloaded a script that has been htmlized, or you've accidentally downloaded a webpage with the script on.
Check the top line of the file. if it starts with something like #!/usr/bin/bash then it's the former and you just need to reverse the changes. If it has something like a <html> tag as the start, then you've downloaded the webpage - go back to where you got it and look for something like a 'raw' link