[Bug 1481579] [NEW] amavisd-new throws stderr when running cron job

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You have been subscribed to a public bug by Robie Basak (racb):

- Ubuntu 14.04.2 LTS
- amavisd-new 1:2.7.1-2ubuntu3

/etc/cron.d/amavisd-new

```
#
#  SpamAssassin maintenance for amavisd-new
#
# m h dom mon dow user  command
18 */3  * * *   amavis  test -e /usr/sbin/amavisd-new-cronjob && /usr/sbin/amavisd-new-cronjob sa-sync
24 1  * * *   amavis  test -e /usr/sbin/amavisd-new-cronjob && /usr/sbin/amavisd-new-cronjob sa-clean
```

The contents of `/usr/sbin/amavisd-new-cronjob` file:

```
if ! perl -MMail::SpamAssassin -e "my \$spamtest = Mail::SpamAssassin->new();
\$spamtest->compile_now (); \$spamtest->{conf}->{use_bayes} ? exit 0 : exit 1"
then
        #bayes is disabled - just exit
        exit
fi

case $1 in
        sa-sync)
                /usr/bin/sa-learn --sync 2>&1 >/dev/null
                ;;
        sa-clean)
                /usr/bin/sa-learn --sync --force-expire 2>&1 >/dev/null
                ;;
        *)
                echo "$0: unknown cron routine $1" >&2
                exit 1
                ;;
esac

```

There are 2 problems here:

1. It throws a stderr message at the first time running:

```
bash -x /usr/sbin/amavisd-new-cronjob sa-sync
+ test -e /usr/bin/sa-learn
+ test -e /usr/sbin/amavisd-new
++ id --name -u
+ '[' amavis '!=' amavis ']'
+ set -e
+ umask 022
+ perl -MMail::SpamAssassin -e 'my $spamtest = Mail::SpamAssassin->new();
$spamtest->compile_now (); $spamtest->{conf}->{use_bayes} ? exit 0 : exit 1'
config: created user preferences file: /var/lib/amavis/.spamassassin/user_prefs
+ case $1 in
+ /usr/bin/sa-learn --sync
+ exit 0
```

This should be silent as it's run in a cron job.

2. To redirect both stdout and stderr to /dev/null, the redirection
order should `>/dev/null 2>&1` instead of `2>&1 >/dev/null` (this one
just redirects stdout).

** Affects: amavisd-new (Ubuntu)
     Importance: Undecided
         Status: New

-- 
amavisd-new throws stderr when running cron job
https://bugs.launchpad.net/bugs/1481579
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