09-21-2010
Were you logged in as "root" or as a normal user?
If this is an operational system you will be advised to get your Systems Administrator to repair the problem.
Assuming this is a training course on an expendable test system we can continue.
If you were logged in as root you have attempted to replace your root crontab with a file called "a.cron". This failed.
However I would have expected the error message:
"crontab: error on previous line; unexpected character found in line."
Even with your error message I doubt if it changed the crontab.
The script called "a.cron" contains errors. As a minimum in unix all backslash (\) characters should be solidus characters (/) in pathnames. If you have not tested the script you should not put it into a cron.
After repairing the script. You probably just need to run "crontab -e" again and change each backslash (\) to solidus (/). This is because unix syntax for a path is different from Microsoft syntax for a path.
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CRON(8) System Manager's Manual CRON(8)
NAME
cron - daemon to execute scheduled commands (Vixie Cron)
SYNOPSIS
cron
DESCRIPTION
Cron should be started from /etc/rc or /etc/rc.local. It will return immediately, so you don't need to start it with '&'.
Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory. Cron
also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see crontab(5)). Cron then
wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute. When execut-
ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab, if
such exists).
Additionally, cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
cron will then examine the modtime on all crontabs and reload those which have changed. Thus cron need not be restarted whenever a crontab
file is modified. Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.
SEE ALSO
crontab(1), crontab(5)
AUTHOR
Paul Vixie <paul@vix.com>
4th Berkeley Distribution 20 December 1993 CRON(8)