01-18-2006
Check for specific files
Ok, i have a problem and not sure how to tackle this one as of yet.
I will have this job running in the cron every 5 minutes, i need it to check a directory for 5 files. These files are put into a directory from five different servers.
These 5 files will only have one part different in them, and that is what server they have come from. I need to check for these different files. I have put the file names into an array from a parameter file and just need to check them. the rest of the filename is just the date that the file was created.
is there an easy way to check a directory for the files, and check that each server has sent a file? there could be more than these 5 files in this one directory but they all have the extention .signed.off
once these 5 files are in there i have another process written for it to do something with these 5 files, so thats no problem (atm)
um.. i hope this makes sense.
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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)