Re: notify via virtual terminal available packages

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From	Greg Wooledge <wooledg@eeg.ccf.org>
Newsgroups	linux.debian.user
Subject	Re: notify via virtual terminal available packages
Date	Thu, 24 Sep 2020 16:40:02 +0200
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On Thu, Sep 24, 2020 at 08:10:04AM -0600, Charles Curley wrote:
> On Thu, 24 Sep 2020 09:53:59 -0400
> Greg Wooledge <wooledg@eeg.ccf.org> wrote:
> 
> > RANDOM is a bashism, not available in sh, so that won't work in a
> > crontab unless you've altered which shell cron is using to parse the
> > crontab.
> 
> Well, that's interesting. The file I pulled that from (in /etc/cron.d)
> sets two variables explicitly:
> 
> SHELL=/bin/sh
> PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
> 
> And the machine that it runs on shows:
> 
> root@hawk:~# ll /bin/sh
> lrwxrwxrwx 1 root root 4 Jan 17  2019 /bin/sh -> dash*

In dash, RANDOM does nothing; it's just an empty variable.  And as it
turns out, dash treats that as a zero.

unicorn:~$ dash
$ echo $((1 + RANDOM % 1200))
1
$ echo $((1 + % 1200))
dash: 2: arithmetic expression: expecting primary: "1 + % 1200"
$ echo $((1 + XYZZY % 1200))
1

So you're just doing "sleep 1" every time.

Thread

notify via virtual terminal available packages Pòl Hallen <deben@fuckaround.org> - 2020-09-23 22:50 +0200
  Re: notify via virtual terminal available packages john doe <johndoe65534@mail.com> - 2020-09-24 10:40 +0200
  Re: notify via virtual terminal available packages Charles Curley <charlescurley@charlescurley.com> - 2020-09-24 15:50 +0200
    Re: notify via virtual terminal available packages Greg Wooledge <wooledg@eeg.ccf.org> - 2020-09-24 16:00 +0200
      Re: notify via virtual terminal available packages Greg Wooledge <wooledg@eeg.ccf.org> - 2020-09-24 16:40 +0200
        Re: notify via virtual terminal available packages Charles Curley <charlescurley@charlescurley.com> - 2020-09-24 16:50 +0200
          Re: notify via virtual terminal available packages Greg Wooledge <wooledg@eeg.ccf.org> - 2020-09-24 17:00 +0200
          Deterministic delays in POSIX shell scripts (Was: Re: notify via  virtual terminal available packages) Andy Smith <andy@strugglers.net> - 2020-09-25 09:50 +0200
            Re: Deterministic delays in POSIX shell scripts (Was: Re: notify via  virtual terminal available packages) Greg Wooledge <wooledg@eeg.ccf.org> - 2020-09-25 13:50 +0200
              Re: Deterministic delays in POSIX shell scripts (Was: Re: notify via  virtual terminal available packages) Andy Smith <andy@strugglers.net> - 2020-09-25 14:30 +0200
                Re: Deterministic delays in POSIX shell scripts (Was: Re: notify via  virtual terminal available packages) David Wright <deblis@lionunicorn.co.uk> - 2020-09-26 04:50 +0200
      Re: notify via virtual terminal available packages Charles Curley <charlescurley@charlescurley.com> - 2020-09-24 16:40 +0200

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