There doesn't seem to be one and I use both cron (which has a tag) and 'at' at different times. I'm not able to add a tag at this time.
Tags just for more common commands would be very helpful. I would be able to help people with 'nedit' but no other editors, or 'alpine' but not other email interfaces.
Thanks!
We don't need a tag for every software or utility tool.
The nearest tag is schedule, I believe. It should likely be coupled with command-line for the at program and related questions. The schedule tag's tag wiki and excerpt are as follows:
The schedule tag should be used for questions about scheduling events, like running applications or processes on a planned time.
This seems to fit, because at does this, according to its manpage (from http://manpages.ubuntu.com/manpages/wily/en/man1/at.1.html):
at and batch read commands from standard input or a specified file which are to be executed at a later time, using
/bin/sh
We don't need a tag for every software or utility tool, but a tag for at does have one advantage. If you trying to search for something related to the at tool, it is really hard as it just a common word. For example, searching for at on askubuntu returns 36k results.
at software.
at command - if there are only 10 it doesn't need a tag, but if there are 10000, then maybe. The search posed by Dan earlier is a keyword search so there's thousands of extra items caught because 'at' is a frequent word in the English language, therefore that search is invalid.
at currently because it is such a common English word. If we had a tag then people could search for it. (I don't necessarily support the idea, just clarifying that point)
atd which is what at works with - I can't tell time distribution but that sounds like a relatively infrequently used tag or question base
at/atdis ~14... This query looks legit enough, 23 results and 7 out the first 10 could legitimately be tagged with it. The only thing I'd like to add is that as Dan remarks in the comments under Thomas. W's answer currently those are completely unbrowseable due to the overwhelming number of posts containing the preposition "at". Something to think about before deciding.atis one of those commands that when I Google it, I really don't get relevant results becauseatis one of those common words and Google might even filter it out when forming a query. I never would have thought to look for the tag 'schedule'.