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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!news.misty.com!weretis.net!feeder9.news.weretis.net!xmission!nnrp.xmission!.POSTED.shell.xmission.com!not-for-mail From: gazelle@shell.xmission.com (Kenny McCormack) Newsgroups: comp.unix.shell Subject: Re: Checking for right # of args in a shell script (Was: a sed question) Date: Fri, 20 Dec 2024 17:43:34 -0000 (UTC) Organization: The official candy of the new Millennium Message-ID: References: <874j304vv3.fsf@example.com> Injection-Date: Fri, 20 Dec 2024 17:43:34 -0000 (UTC) Injection-Info: news.xmission.com; posting-host="shell.xmission.com:166.70.8.4"; logging-data="2068870"; mail-complaints-to="abuse@xmission.com" X-Newsreader: trn 4.0-test77 (Sep 1, 2010) Originator: gazelle@shell.xmission.com (Kenny McCormack) Bytes: 2527 Lines: 38 In article , Janis Papanagnou wrote: .... >> Agreed, in general, but in practice, the need rarely arises. > >I certainly disagree on this; if you have 10..19 (or 100..199 etc.) >arguments the '<' test just doesn't trigger but '-lt' does. I mean, >why use a wrong operator. If it will only in specific cases produce >correct results, or if it produced in most cases correct results; >it's just the wrong thing. We're not talking about the same thing. >> >> The idiomatic way to do this is just: >> >> [ $# = 2 ] || usage() > >Yes, but I don't use that but prefer (like you) [[...]], an in, say, [ ] is easier in the simple cases. But, whatever, either way is fine. >> Also, when I need to do more complex arg verification, I use bash's [[ ]] >> mechanism (Yes, I know OP is using /bin/sh, but there is no reason nowadays >> not to use bash). > >If the OP is on Linux the 'sh' might actually be a Bash. If he's, I assume Linux unless/until I hear otherwise. And I tend to also assume some Debian-based Linux (again, unless/until ...). In Debian-based Linuxes, sh is "dash", which is pretty much a minimal subset/POSIX-compliant version of the shell. So, [[ ]] isn't available there. -- The randomly chosen signature file that would have appeared here is more than 4 lines long. As such, it violates one or more Usenet RFCs. In order to remain in compliance with said RFCs, the actual sig can be found at the following URL: http://user.xmission.com/~gazelle/Sigs/GodDelusion