01-26-2007
Probably your cron job is running.
However it fails.
A cron runs with a very limited PATH.
Depending on whether it is a root or ordinary user cron job the PATH is simething like:
root: PATH=/usr/bin:/usr/sbin
ordinary user: /usr/bin
When you execute a command on a shell prompt you usually have a much bigger PATH
So, if your script uses a command which is not located in /usr/bin (and /usr/sbin) the command will fail and therefore the cronjob.
That way it seems is if the cron never ran.
Therefore, to avoid this define PATH at the start for your script.
Since you do not redirect standard error, but only standard out, you never see anything indicating your cronjob went wrong.
You can check the cron log to see if the cronjob actually started.
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CRON(8) System Manager's Manual CRON(8)
NAME
cron - clock daemon
SYNOPSIS
auth/cron [-c]
DESCRIPTION
Cron executes commands at specified dates and times according to instructions in the files /cron/user/cron. It runs only on an authentica-
tion server. Option -c causes cron to create /cron/user and /cron/user/cron for the current user; it can be run from any Plan 9 machine.
Blank lines and lines beginning with # in these files are ignored. Entries are lines with fields
minute hour day month weekday host command
Command is a string, which may contain spaces, that is passed to an rc(1) running on host for execution. The first five fields are integer
patterns for
minute 0-59
hour 0-23
day of month 1-31
month of year 1-12
day of week 0-6; 0=Sunday
The syntax for these patterns is
time : '*'
| range
range : number
| number '-' number
| range ',' range
Each number must be in the appropriate range. Hyphens specify inclusive ranges of valid times; commas specify lists of valid time ranges.
To run the job, cron calls host and authenticates remote execution, equivalent to running rx host command (see con(1)). The user's profile
is run with $service set to rx.
Cron is not a reliable service. It skips commands if it cannot reach host within two minutes, or if the cron daemon is not running at the
appropriate time.
EXAMPLES
Here is the job that mails system news.
% cat /cron/upas/cron
# send system news
15 8-17, 21 *** helix /mail/lib/mailnews
%
SOURCE
/sys/src/cmd/auth/cron.c
SEE ALSO
con(1), rc(1)
CRON(8)