Re: [PLUG] Shell syntax vs crontab syntax

["Rev. LeRoy D. Cressy via plug" <plug@lists.phillylinux.org>]

Hi Walt,

crontab accesses /bin/sh which is usually a symlink to a shell and not always bash.  Bash behaves differently when invoked from /bin/sh.

Stackoverflow has a good article on this.

https://stackoverflow.com/questions/26717870/why-does-bin-sh-behave-differently-to-bin-bash-even-if-one-points-to-the-other


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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, August 23, 2019 10:07 AM, Walt Mankowski via plug <plug@lists.phillylinux.org> wrote:

> I run fail2ban and it generates a lot of email. I decided to switch
> from putting everything in one enormous maildir to monthly maildirs.
> Rather than making a whole bunch (and then likely forgetting about it)
> I figured I'd make a cron job that would add the next month's folder.
>
> If I run this on the command line it works fine:
>
> maildirmake /tmp/fail2ban.`date --date='next month' '+%Y%m'`
>
> But when I tried to use that same syntax in my crontab I got the message:
>
> /bin/sh: 1: Syntax error: EOF in backquote substitution
>
> What ended up working was this:
>
> maildirmake /tmp/fail2ban.`date --date='next month' \\+\\%Y\\%m`
>
> I've run into situations like this in the past where the quoting rules
> for the shell and crontab seem to be different. I've never found
> anything that explains why it's different. Is it because I'm using
> zsh?
>
> Walt
>
> Philadelphia Linux Users Group -- http://www.phillylinux.org
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