crontab execute consecutively

SofNine · 07-24-2006, 05:54 PM

Hi,

I want to execute the my jobs consecutively, is that possible with crontab. After one job is finished the next starts.....and so on.

thanks

Matir · 07-24-2006, 06:06 PM

Sure, just create an entry with a command like:

Code:

15 1 * * * command1 && command2 && command3 && command4

SofNine · 07-24-2006, 06:19 PM

hi matir,

thanks for your response,
does it mean, that I assign a starttime and then connect each of my tasks with &&......that's it

does it have to be in one line or can I make newlines too.....

Code:

15 1 * * * command1 && 
command2 && 
command3 && 
command4

or something like that.....due to keeping track...

Matir · 07-24-2006, 06:23 PM

Cron jobs should each appear on a single line. If you need a large number of commands, I encourage placing them in a shell script and then executing this shell script rather than placing all the commands within the cron job.

SofNine · 07-24-2006, 07:20 PM

ok, thanks

SofNine · 07-25-2006, 07:00 PM

hi,

is ist possible to execute one command in the script with root and the others with the normal user?

my script is invoked usually as normal user, but I want one command to be executed as root....

Matir · 07-25-2006, 07:34 PM

You can use sudo to accomplish that.

SofNine · 07-26-2006, 01:03 AM

hi,

I have tried it with sudo. They tell you that you have to make an entry in /etc/sudoer, which I have done. I have a script which executes several commands, one of them needs root privileges.
And I want the script to execute this command without asking for the password, but with the following it still asks for the password.

the entry in my sudoer file looks like:

Code:

# User privilege specification
root    ALL=(ALL) ALL
Hubert ALL=(ALL) NOPASSWD: /home/Hubert/database_update.sh

the database_update script:

Code:

#!/bin/sh
......
sudo rm -rf /usr/local/database
.......

thanks

Matir · 07-26-2006, 09:22 AM

The part after the NOPASSWD: has to be the command to be executed as root (in this case, "rm -rf /usr/local/database").

SofNine · 07-26-2006, 11:46 AM

hello matir,

I have done what you told me, but I get still permission denied. Is there anything else?

thanks

Matir · 07-26-2006, 11:50 AM

You may need to specify a full path to rm in both sudoers and the command line itself (/bin/rm).

SofNine · 07-26-2006, 01:24 PM

hi matir,

ok, I assume there is something wrong with my distribution, I get the following error:

Code:

>>> sudoers file: syntax error, line 22 <<<
sudo: parse error in /etc/sudoers near line 22

Matir · 07-26-2006, 01:37 PM

Please post the full contents of your current sudoers file.

SofNine · 07-26-2006, 03:23 PM

hi,
sudoer file:

Code:

# sudoers file.
#
# This file MUST be edited with the 'visudo' command as root.
#
# See the sudoers man page for the details on how to write a sudoers file.
#

# Host alias specification

# User alias specification

# Cmnd alias specification

# Defaults specification

Defaults    env_reset
Defaults    env_keep = "COLORS DISPLAY HOSTNAME HISTSIZE INPUTRC KDEDIR \
                        LS_COLORS MAIL PS1 PS2 QTDIR USERNAME \
                        LANG LC_ADDRESS LC_CTYPE LC_COLLATE LC_IDENTIFICATION \
                        LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC \
                        LC_PAPER LC_TELEPHONE LC_TIME LC_ALL LANGUAGE LINGUAS \
                        _XKB_CHARSET"

# Runas alias specification

# User privilege specification
root    ALL=(ALL) ALL
Hubert ALL=(ALL) NOPASSWD: "/usr/bin/cvs -d :pserver:cvs@code.open-bio.org:/home/repository/bioperl checkout bioperl-live"

# Uncomment to allow people in group wheel to run all commands
# %wheel        ALL=(ALL)       ALL

# Same thing without a password
# %wheel        ALL=(ALL)       NOPASSWD: ALL

# Samples
# %users  ALL=/sbin/mount /cdrom,/sbin/umount /cdrom
# %users  localhost=/sbin/shutdown -h now


~

if I execute the cvs command on the command line it works just fine....of course as root

Matir · 07-26-2006, 03:32 PM

Try removing the quotes from around the command, similar to the format of other commands in the file.