Ubuntu Servers :: Crontab Or Other (script) To Automatically Replace File?
May 18, 2011
I have been searching for a few hours now trying to figure out the best way to have Ubuntu Server 8.10 copy and replace a file every week.
So for example:
File A (original file)
File B (replacement file)
I would want to copy File B from its location and replace File A each week automatically with out removing or destroying File B.
I've thought of doing a cron since I already have a job set for email piping. but I'm unsure of the best way to complete this task.
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Apr 27, 2010
I am using Linux 64 bit Redhat Linux. I am trying to setup simple crontab as follow...1. Edited crontab file using crontab -e2. Listed the file once to verify it using crontab -l. This will display as.. 18 5 * * 2-3 ksh $HOME/testScript.sh > $HOME/testscript.out3. Logged in a root and restarted cron deamon using "/etc/init.d/crond restart"As per my understanding now my testScript should start running at 5:18 am Thuesday
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Mar 16, 2014
Is there any way to use sed to replace certain text in a file with the persons username automatically? Right now i'm using
Code: Select allsed -i.bak s/STRING_TO_REPLACE/STRING_TO_REPLACE_IT/g file.foo
I would like it to automatically inject the persons usrname in the replacement string. Is this possible? I've been looking on line at various sed tutorials and I cant quite find what i'm looking for. I also didn't really see anything in the forums search function.Essentially i'm trying to take this file URL...Android.rules and replace all instances of username with the persons actual username automatically.
Code: Select allsed -i.bak s/username/$USER/g 51_Android.rules
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Aug 26, 2010
I have a question about using crontab with /etc/crontab...
I had a cron job that I needed to run as root. At the time I thought that sticking it in /etc/crontab would be a good idea. However, I used the crontab command to edit /etc/crontab, which I guess is not standard procedure? Specifically, I configured /etc/crontab as my local user's crontab (i.e. sudo crontab /etc/crontab) then added my cron job as I would a local user crontab (i.e. sudo crontab -e).
Originally, my cron job looked like this:
30 * * * * root /my/batch/script &> /dev/null
After adding the new cron job I started seeing errors. Something to the effect of "can't find command root" or something similar. So I removed the 'root' user definition from the cron job and the job started running fine. However, because this is /etc/crontab, there are other system related cron jobs that have been defined to run under the root account (e.g. "17 * * * * root cd / && run-parts --report /etc/cron.hourly" runs as root, etc.). So these pre-existing system cron jobs, which up until now have been running smoothly, are now generating "can't find command root" errors. But I think that the system cron jobs _are_ successfully being run someplace because logrotate seems to be working.
So what I _think_ is happening is that /etc/crontab is being run twice: once as the system crontab, and once as my sudoed local user's crontab. When I run crontab -l I see nothing, but when I run sudo crontab -l I can see the contents of /etc/crontab. I am reluctant to delete my sudoed local user's crontab, because then in the process I would be deleting the system crontab, and I do not know how I should restore the system crontab's contents. (I am still not sure as to the most appropriate way to edit the system crontab).
How can I get out of this mess? I want /etc/crontab to go back to the way it was before--running _once_ as the system crontab. As for my new cron job, I'm willing to reconfigure it anywhere so long as I am still able to run it as root. Any ideas? (I am using Ubuntu 8.04 Server LTE)
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Jul 22, 2010
We have a couple of Windows file servers that just share files. It is all they do. We'd like to use Ubuntu on two replacement servers allowing Windows XP and Windows 7 clients to access the files. Our network is active directory based due to Exchange and homegrown .NET apps, so it is important that active directory is used to authenticate the clients. Samba doesn't need to be a pdc or bdc, but provide pass through authentication.I understand that Samba can communicate with active directory through security-ads and security-domain.
Here are my questions to see if I should proceed:1) Folder permissions:If we move all our files to the Ubuntu server how do we set folder permissions and will we see the active directory accounts when we do this?2) Skipping ubuntu accounts: I know the domain and ads allow you to skip creating ubuntu accounts, right? If not, how do you keep the passwords synchronized?3) Easiest way? Is there a very easy way to pull this off that I've missed? My goal is to eliminate the Windows based file servers while ensuring the admin part of it is as easy as possible.To date I've been able to get the sharing to work with an ubuntu account mirroring the active directory account. I've been able to get Samba to talk to the pdc, but not successfully through domain security. ADS security was a complete cluster with winbindd
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Feb 9, 2011
I'm trying to replace an office file server. I would like to avoid just another samba share.
I'm looking for a document repository, a bit more functionality than a plain samba share and very cross-platform.
I've looked a couple minutes at dspace, but that seems like a lot of work just configuring it. Dropbox would be fine except that they only have up to 100g, and it's off-site.
This is NOT for unauthenticated public use.
Here are some features I have in mind:
1. Web front end.
2. Any file format from a one-line text document to a Microsoft Word document to an ISO of a blu-ray disk to a very large database backup, binary or text.
3. Cross-platform clients, mostly Mac.
4. Authenticated via centralized one-login server or maybe by a key such as an SSH public key.
5. Searchable by terms, name or content if the type is appropriate.
6. Pass in the URL for an object and have the server download it.
7. Stores files in native format so if the app breaks I can just get the files.
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Apr 9, 2011
I have installed an application manager(monitoring application) on my linux server. Now, i need to have backup schedule for my application. The application itself has executive file to backup database.But when i put this file in my crontab to schedule the backup program it wont run!50 09 * * * root /opt/ME/AppManager9/bin/BackupMysqlDB.sh
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Apr 27, 2010
I have a little problem: I have a share folder on Ubuntu server: - Dump That folder is share with SAMBA and everyone can put files on it
My problem is the following: When someone create a folder, the folder permissions are automatically set with:
(let's take my username: Yann)
Owner: Yann
Group: Yann
Clearly that's wrong.. I want the Group to be auto set has "users" so everyone can access the folders on that share. Anyone know how to change this ? chmod and chown is getting a bit boring
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Aug 3, 2011
I'm looking for a way to have a file automatically emailed after the last script finishes entering data into it. What would be the best way to do it?
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Feb 28, 2011
I am having trouble getting grub to automatically boot into ubuntu server. When I turn on my server the grub menu shows up and shows me the choices. They all work fine except that grub wont automatically select one. This wouldn't be too much of a problem but this is a headless server and I can't boot into ubuntu without a keyboard. I tried looking through the grub 2 documentation but nothing seemed to work when I edited the conf file.
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Apr 5, 2010
i want to Xampp run and start all time when i start pc. i don know correct command for use crontab when i want to use it i must delete ># m h dom mon dow commandor not ?
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May 25, 2010
I set a backup copy of your home computer. I have a problem. A copy of the full exercise once a month
Code:
15 22 1 * * / root / scripts / bcsys.sh full
incremental and would like to do on a daily basis since 22, but aside 1 day each month when it comes to full
Code:
00 22 * * * / root / scripts / bcsys.sh incremental
How can this be set and whether there is a possibility?
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Jan 27, 2011
Cron seems to be running the script below (According to /var/log/syslog) but I'm not receiving the email it should send. This does work when I invoke it manually. checkraid (-rwxr-xr-x 1 root root)
Code:
#!/bin/bash
echo `/sbin/dmraid -s > /etc/check-raid/check_state`
index=0
while read line; do
[Code]...
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Jul 28, 2010
I would like to make a crontab task to email a log file to me every night.
How would i do this? I know how to make crontab jobs (and sett the time on them), i just dont know the command i would write for this particular job.
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Aug 4, 2010
I have a .sh file which i want to run using crontab at a specific time with root privilege.
I put an entry in root's crontab as the following:
sh /home/vivek/ifconfig/college.sh
But, the file do not get executed at a given time.
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May 9, 2011
I have written a simple backup script, and added it to CronTab, but it doesnt execute at all. Here is my script: [URL]...And my CronTab entry: 0 */2 * * * root /home/server/Scripts/backup.sh
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Jul 2, 2011
How to set crontab not send mail notification to the owner script if the script success running? because I'm monitoring mail server, and notification from cron is not necessary for me. I'm using ubuntu 10.04 server
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Jun 23, 2011
is it possible disabling a crontab job without deleting the crontab description entry (by crontab -e)?I could also accept to change the entry itself. Now it's:0 0 * * 0-6 /home/me/cron/script.csh
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Apr 15, 2010
A couple days ago I noticed cron stopped working and now I can't create a new file using crontab -e. When I hit crontab -e I get the editor but after saving nothing comes up under crontab -l and the file is blank when I reopen it. I don't have a cron.allow or a cron.deny.
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Jul 14, 2010
I want to append a text string onto an existing file from crontab. These do not work:
0 1 * * * cp "test" >> /home/xys/myfile.txt
0 1 * * * mv "test" >> /home/xys/myfile.txt
0 1 * * * cp 'test' >> /home/xys/myfile.txt
0 1 * * * mv 'test' >> /home/nys/myfile.txt
How can this be done?
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Jul 3, 2010
As root, I use crontab to run mirrordir to backup directories. Everything gets copied over properly, but owner information isn't preserved and root is the owner of all the backed up files. I can deal with that, but crontab reports tons and tons of chown/chgrp errors for mirrordir every time I do back ups--which is every day--and the multiple emails to root of thousands of chown/chgrp errors is very annoying. The error is "Operation not permitted," but that doesn't make sense to me because the job runs as root (right?) and clearly the job is permitted to create the backup files, so why would it fail to chown and chgrp?
I've had the exact same setup on another server for years, and crontab has always run mirrordir without error. Any suggestions how to clear the errors on my new server?
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Nov 21, 2010
I am trying to run rsnapshot from cron via root's crontab file (crontab -e). If I run rsnapshot from the command line with sudo it works perfectly, however, if I run it from cron:
Code:
* * * * * /usr/bin/rsnapshot hourly >/tmp/crontab.out 2>/tmp/crontab.err
This does not work. The crontab.err file shows:
[Code]....
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May 6, 2010
I want to get mail from the crontab log file....
How to set log file in crontab and the second and how can i get mail from the crontablog file.
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Feb 11, 2011
i want to do scheduling using /etc/crontab file instead of using crontab -e that is crontab command on the terminal.i am appending to the crontab file in the /etc directory but the scheduling is not happening
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Jun 7, 2010
I attempted to run various cron jobs as root - just general server make-tidy stuff. But if I edit the /etc/crontab file directly, these tasks don't get run. However, if I use crontab -e as root, these jobs appear to work. Any idea why this might be the case? Also, I understand that user cron jobs are stored in /var/spool/cron/<user> (including root). If this is the case, what's the purpose of the /etc/crontab file?
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Jul 28, 2009
I have script that I'm working on that updates a username in all the files that are called blah.inc for my framework. since i host a bunch of these web apps i need to do it to all of them. so I need to figure out how to update these files automagically with out me watching it to call vim every time. heres what I have so far
Code:
This finds the files but now i need to figure out how to do s/bob/fred/g on those files.
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Jun 6, 2010
I used crontab to set a file playing at a certain time, this works fine; however I want this to run even if no-one is logged in (but the computer is on). I can't get it to do this
Line is: 30 06 * * * env DISPLAY=:0.0 /usr/bin/totem /home/adunaic/Playlist.pls
Okay I think the problem was with needing a GUI.
Using this instead works, but i only hear the sound when I log in. I think something needs to be doen to start the audio perhaps?
14 17 * * * export DISPLAY=:0.0 && /usr/bin/mpg123 /home/adunaic/alarm.mp3
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Oct 8, 2010
I've tried to create a crontab that renames a fil extension every minute. This is what I've tried:*/1 * * * * / rename /home/bodil/Avräkningsfiler/'s/.txt/dat/' *.txtBut it doesn't seem to work.I've also tried to create a .sh file in the catalog itself with the command executing directly in the catalog but even though running the command by typing it in, it doesn't run automatically by cron
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May 3, 2011
I have this code that is 'bashed' regularly with crontab and basically it will send me an E-Mail of most of the output but it misses out some of it!
Here is the crontab code to automatically run the script:
Code:
So that sends me an E-mail with most of the output of the following code:
Code:
It sends me everything up to echo "*******" "Begin compressing and transferring files" "*******" but it wont output the tar bit.. so it should give me a list of files that have been tarred.
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Mar 19, 2011
I am trying to have the files from /user/directory copy every hour to /backup/user/directory. It would seem that cron or crontab is what I need to use. Looking at previous posts and other documentation only shows how much I don't know. When I type crontab -e I get a blank file I can type into, seemingly using vi as the editor. I have no problem with that but when I type cron -l, I get my text after a message about "Do Not Edit this File". What I am reading just makes no sense, I am not understanding even the most fundamental aspects of cron or crontab. Where I can get the most basic of basic instructions to try to understand this function?
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