Another reason against copy-pasting from the web is using unicode characters that look like ASCII ones. This was on HN a week or so ago, but it doesn't hurt to

Another reason against copy-pasting from the web is using unicode characters that look like ASCII ones. This was on HN a week or so ago, but it doesn't hurt to repeat. Example shell command: eⅽho 'hello world' Copy-pasting the above command will fail with the message `eⅽho: command not found`. The reason? 'ⅽ' in 'eⅽho' is a unicode character "SMALL ROMAN NUMERAL ONE HUNDRED" that looks identical to regular ascii 'c'. The above can also be mis-used for any programming language, not just shell commands.