- ISO 8601 is paywalled
- RFC allows a space instead of a T (e.g. 2020-12-09 16:09:...) which is nicer to read.
this post was submitted on 12 Dec 2023
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On the command line, space is what separates each argument. If a path contains a space, you either have to quote the entire path, or use an escape character (e.g. the
\character in most shells, the backtick in Powershell because Microsoft is weird, or the character's hexadecimal value), otherwise the path will be passed to the command as separate arguments. For example,cat hello world.txtwould try to print the fileshelloandworld.txt.It is a good practice to minimize the character set used by filenames, and best to only use English alphanumeric characters and certain symbols like
-,_, and.. Non-printable characters (like the lower half of ASCII), weird diacritics (like ő or ű), ligatures, or any characters that could be misinterpreted by a program should be avoided.This is why byte-safe encodings, like base64 or percent-encoding, are important. Transmitting data directly as text runs the risk of mangling the characters because some program misinterpreted them.
but what does the command line matter for dates? sure every once in a while you'll have to pass a date as an argument on the command line but I think usually that kind of data is handled by APIs without human intervention, so once these are set up properly, I don't see the problem
If the
datecommand returns an RFC-3339-formatted string, the filename will contain a space. If, for example, you want to iterate over the files usingfor d in $(find...)and forget to set$IFSproperly, it can cause issues.But
$(date)does return a string with spaces, at least on every system I've ever used. And what's so bad about the possibility of spaces in filenames? They're slightly inconvenient in a command line, but I haven't used a commuter this century that didn't support spaces in filenames.Bro, literally re-read the comment you replied to. It has an example of what might happen.
Ok, I just reread it. I don't see what you think I'm missing. You mean an improperly written find command misbehaving? The fact that a different date format could prevent a bug from manifesting doesn't seem like much of an argument.
Spaces can exist in filenames. The only problem is that they have to be escaped. As the comment that you reread explained,
cat hello world.txtwould print the fileshelloandworld.txt. If you wanted to print the file"hello world.txt"you'd either need to quote it (cat "hello world.txt") or escape the space (cat hello\ world.txt)Oh, the horror!