Redirecting output with sudo

Here is one that has been bugging me off and on for some time.
I want to execute a program using sudo, and redirect its output some place to which user invoking sudo does not not have write permission
Simplistically, something like:
JoeUser$ sudo echo "Appended stuff" >> /etc/afile
I understand why this won't work, but for the life of me, I cannot find an incantation that works. I think it is complicated by the use of commands that are intrinsic to the shall (cat, echo)
I have been through the zsh and bash manuals and have tried various commands to define a block of code to no avail.
Any hints?

tavianator wrote:
Hate to tell a forum mod to RTFM, but:
man sudo wrote:sudo sh -c "cd /home ; du -s * | sort -rn > USAGE"
If the shoe fits....
Thanks everyone. The pipe works in a lot of cases.
Invoking bash with sudo and passing commands is the obvious way (once someone points it out). I guess I could not break out of the box I had built in order to look at the problem from a different angle.

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Issues with using the output redirection character with newer NXOS versions?

Has anyone seen any issues with using the output redirection character with newer NXOS versions?
Am receiving "Error 0x40870004 while copying."
Simply copying a file from bootflash to tftp is ok.
This occurs for both 3CDaemon and Tftpd32 softwares.
Have tried it on multiple switches - same issue.
Any known bugs?
thanks!
The following is an example of bad (NXOS4.1.1b) and good (SANOS3.2.1a)
MDS2# sho ver | inc system
system:    version 4.1(1b)
system image file is:    bootflash:///m9200-s2ek9-mz.4.1.1b.bin
system compile time:     10/7/2008 13:00:00 [10/11/2008 09:52:55]
MDS2# sh int br > tftp://10.73.54.194
Trying to connect to tftp server......
Connection to server Established. Copying Started.....
TFTP put operation failed:Access violation
Error 0x40870004 while copying tftp://10.73.54.194/
MDS2# copy bootflash:cpu_logfile tftp://10.73.54.194
Trying to connect to tftp server......
Connection to server Established. Copying Started.....
|
TFTP put operation was successful
MDS2#
ck-ci9216-001# sho ver | inc system
system:    version 3.2(1a)
system image file is:    bootflash:/m9200-ek9-mz.3.2.1a.bin
system compile time:     9/25/2007 18:00:00 [10/06/2007 06:46:51]
ck-ci9216-001# sh int br > tftp://10.73.54.194
Trying to connect to tftp server......
|
TFTP put operation was successful

Please check with new version of TFTPD 32 server. The error may be due to older version of TFPT server, the new version available solved this error. Files are getting uploaded with no issues.
1. Download tftpd32b.zip from:
http://tftpd32.jounin.net/tftpd32_download.html
2. Copy the tftpd32b.zip file into an empty directory and extract it.
3. Copy the file you want to transver into the directory containing tftpd32.exe.
4. Run tftpd32.exe from that directory. The "Base Directory" field should show the path to the directory containing the file you want to transfer.
At this point, the tftpserver is ready to begin serving files. As devices request files, the main tftpd32 window will log the requests.
Best Regards...

[SOLVED] Don't have permission to turn off bluetooth, even with sudo!

I never use bluetooth on my laptop, but every time I boot arch the radio and light are both on. I tried unloading the bluetooth module, using bluez and other tools to shut off bluetooth, etc., but that radio just stays on. After searching the web for a while, I finally found the solution: cut off power to the device. I can do that with this command:
echo "0" > /sys/devices/platform/sony-laptop/bluetoothpower
And turn it back on by changing "0" to "255". The only problem is, I can't run this as a normal user, and I can't even run it with sudo! Here is the output:
$ echo "0" > /sys/devices/platform/sony-laptop/bluetoothpower
zsh: permission denied: /sys/devices/platform/sony-laptop/bluetoothpower
$ sudo echo "0" > /sys/devices/platform/sony-laptop/bluetoothpower
zsh: permission denied: /sys/devices/platform/sony-laptop/bluetoothpower
(I'm using zsh but this also happens with bash)
However, I can su to root and run this command successfully
$ su
Password:
# echo "0" > /sys/devices/platform/sony-laptop/bluetoothpower
And off goes the light. I would like to somehow turn off bluetooth at boot, but I don't know how to have Arch run a command as the root user at boot after loading the modules (to ensure the bluetooth radio is not started up again). It seems that bluetoothpower is created at each boot, because I tried changing the permissions to read & write for all, then adding the command to my .xinitrc. This worked, but only during that session. After rebooting I had the same problem.
Help?
Last edited by Allamgir (2009-07-29 13:44:40)

Yes! Yet again the wiki has saved me! I followed this part: http://wiki.archlinux.org/index.php/Pm- … _own_hooks
I just set it to turn off bluetooth upon resume, and it works! yay!
Thanks everyone!

Executing multiple commands with sudo fails

Hi,
We're having trouble with sudo and bash. When we want to execute multiple commands and there are spaces, the commands don't run. Here's an example of what works:
[root@erpapp1-prod ~]# sudo -i -u oracle bash -c 'ls;pwd'
In this case, I get a listing of the files in /home/oracle followed by the current directory of /home/oracle.
Here's an example of what DOESN'T work:
[root@erpapp1-prod ~]# sudo -i -u oracle bash -c 'ls; pwd'
Notice the space before "pwd". In this case, all I get is the listing of files in /home/oracle.
Caveat: I'm a real beginner with Linux. I've compared many of the files (/home/oracle/.bash_profile, /home/oracle/.bashrc, /etc/bashrc, /etc/profile) from this server to another where we don't have issues and, other than some logic being in different order, don't see much of a difference. Again, very beginner here.
Any ideas? Thanks!
Todd

What shows up as a space may not necessarily be a space. For instance, it could be some control character like a newline, which might interfere with the execution. For example:
$ test=`echo -e "test;\ntest"`
$ echo $test
test; test
$ echo "$test"
test;
test
Here is another example:
# test=`echo -e "ls;\npwd"`
# su - oracle -c "$test"
oradiag_oracle
/home/oracle
# su - oracle -c $test
oradiag_oracle
I cannot guess how you construct the command list. Perhaps the problem is a text files that was created under Windows and copied as binary to Linux, or a shell script using a different IFS environment variable, etc.
Personally I would use a different approach. From a security standpoint it is a bad idea to use passwords at the command prompt because every user can see them using the ps -ef output.

[Solved] Running Thunar with sudo/su Causes GVFS Errors?

Hi, I switched from Xubuntu to Arch a few days ago, and am loving it so far, but I'm running into an issue when running Thunar with sudo or su. As a result, trash as root doesn't work. I'm not sure if this is related to GVFS, but drives also do not appear when running Thunar as root. Not too major, since it's just a slight inconvenience, and I only need root privileges with Thunar occasionally. Though it'd be awesome if someone knows how to fix this, since my searching has come up with nothing for a problem like this. When logging in as root itself, the problem doesn't occur, it only happens when running it as my regular account through the sudo or su command.
Here's the terminal output with the errors:
[dark@YiffingInHell ~]$ su
Password:
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(thunar:29855): GVFS-RemoteVolumeMonitor-WARNING **: cannot connect to the session bus: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
(thunar:29855): GVFS-RemoteVolumeMonitor-WARNING **: cannot connect to the session bus: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
(thunar:29855): GVFS-RemoteVolumeMonitor-WARNING **: cannot connect to the session bus: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
Last edited by DarkSniper (2011-04-06 02:43:46)

@janek: It's not good practice to necrobump threads that were posted nearly a year ago.
I have long since devised a better solution than my initial quick fix. I have created a small script that wraps sudo and fetches root's dbus variables, then sticks them before the command I want to run, so that they're run on root's session instead of mine. It's not the most elegant way, but it remains secure and has pretty much no overhead. I also prefer sudo over pkexec, having an agent popup when I enter the command is undesirable, since it's simpler and easier to just enter the password on the command line.
For searcher's sake, this is my little wrapper if anyone's interested in using it.
A small wrapper to go in your path, to be aliased to sudo in your bashrc
!#/bin/bash
#Fetch Root's Dbus Variables and Run The Command
/usr/bin/sudo $(/usr/bin/sudo sed '6q;d' /root/.dbus/session-bus/af16543424391ebcfb5f0c1000000ce2-0) \
$(/usr/bin/sudo sed '7q;d' /root/.dbus/session-bus/af16543424391ebcfb5f0c1000000ce2-0) \
$(/usr/bin/sudo sed '8q;d' /root/.dbus/session-bus/af16543424391ebcfb5f0c1000000ce2-0) "$@"
Then add this to a script that is run as root on boot. [This starts a session for root that allows the wrapper to connect]
Examples include /etc/rc.local; /etc/lxdm/LoginReady; or a systemd unit
dbus-launch --autolaunch af16543424391ebcfb5f0c1000000ce2
NOTE: The "af16543424391ebcfb5f0c1000000ce2" part is different for every system, you can find out what it is for your system by checking the name of the file in /root/.dbus/session-bus.

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Hello,
I am using Oracle reports 10g 1.2.0 version.
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http://otn.oracle.com/products/reports/htdocs/getstart/examples/excel_output/result/excel.jpg
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carla,
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in theory you can create any excel output. it is just a matter of creating the template and then adding the reports tags to populate it with data.
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Attachments:
Digital Output With Timer.vi ‏16 KB

Hello Juventom,
As I understand it you want to be continuously checking the value of the sliding bar and comparing that to the upper and lower limit controls whilest also chaning the LED booleans to true for 5 seconds then false for 10 seconds if the sliding bar value is outside of the limits.
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http://zone.ni.com/devzone/cda/tut/p/id/3749
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hi,
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No Data
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Redirecting output with sudo

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