I try to establish passwords-less communication between mpi of my notes by using some video tutorial. However, at some point what I saw at the screen of the tutorial differ from from what I saw on my screen. As a result I fault to establish needed connection. I guess is that video tutorial missed some steps therefore I didn't get expected result. Let me guide you through the steps.
White screen will be screen of the tutor and black will be mine.
So I successfully establish connection between mpiu of notes I can enter exit ssh ls -la and do other things between my notes and mpiu of the notes. However, each time when I enter to the mpiu the system ask me the passwd so this step I wanna get rid of. For that matter:
I generate RSA key for the rpi0 ( my first note ) and ssh-copy it to the rpi1 ( my second note )
I checked that RSA key located on the both notes for mpiu#rpi1 it will be authorized_key file (as far as i'm understand )
for the mpiu#rpi0 it will be files id_rsa and id_rsa_pub
Now I need to make changes in rpi0 .bashrc file to establish key chain ( here problems begun )
3.1. So I went to home directory, I used vim in order to to edit file
3.2. Here I notice some difference in the file of tutor and mine - the tutor said that in the very end I should add some logic. However, in my file there are two fi , the tutor .bashrc file has only one fi at the end.
3.3. So I added logic after the second fi ( I saw that fi it states from finish => } - so probably it is true end )
3.4. that tutor enter command to apply the changes to the system
3.5. the tutor got this everything ok
but I got this
( take a look at the White-tutor---done-----black---mine-.pdf )
My first thought was I just need to download from the given website ( funtoo.org ) needed program and put it in the needed directory. However, the system deny my copy-past procedure by saying that I I have not rights.
So what should I do ? May be I should install the contain of the zip file to my note ( rpi0 ) by using some Linux command through the terminal ?
[RSA-Check-and-bashrc-files-.pdf][1]
[White-tutor---done-----black---mine-.pdf][2]
Everybody thx for attention. I solved the problem by installing needed programs through the terminal as I thought.
I'm trying to write a program that uses GStreamer to connect to PulseAudio as a source so that I can intercept any audio that's being played. I have no need to play it back so my assumption is that my pipeline only needs a source and demuxer, I'm not sure of the latter though. The hello world example that I'm working off of is here, except that instead of using "filesrc" I'm using "pulsesrc".
Is there a good example that shows this out there already and I haven't found the right combination of terms to make Google give it to me? Do you have to do anything to PulseAudio to make it let you monitor its stream? Should I actually be trying to instead connect to a sink to monitor what's being played?
I think you will need to check the sources with e.g.:
pacmd list-sources | grep -e device.string -e 'name:'
and then connct to the source ending on ".monitor" by using the "device" property of pulsesrc.
I use a NASMT Q700 QNAP NAS. For remote monitoring purposes i want to read some values and save them into a database.
Since the web-interface is very complex and full of javascript, i can not scrape it. So I tried to connect to the NAS with SSH.
Which is great, because SSH is one of the methods, that i can connect with automatically with c# and I get back text that I can parse.
The installed Linux system on the box is a :
Linux NASMT 2.6.33.2 #1 Fri Mar 7 11:55:22 CST 2014 armv5tel unknown
I tried to reach my goal:
man is not installed.
smartctl is not installed. (Google told me to try this out)
I went into the /bin and /usr/bin directories and tried everything suspecious. There seems to be a program called nasutil installed. Only that it is not very self documenting. Various calls with different parameters did not work, i always get the same answer:
nasutil multi-call binary
[function] [arguments]...
Current defined functions:
init_nas_cache, init_admin_group, set_file_owner, chk_flash, reset_all, chk10198, get_trusted_domain, update_krb5_ticket
rescan_hd, check_e2key, burn_e2key, cnt_phy_nic, http_link, ip_filter, hdusb_copy, ims, qpkg, gen_upnp_desc, scanafpdb
eset_system, umount_all_vdd, sss_convert, httpd_init, get_hwsn, get_suid, setsum, getsum, rsyslog_util, radius_util, send_alert_mail, rsync_util
acl_cmd check_ldap clean_reset_pwd network_boot_rescan
I used google on this one but could not find anything useful.
I am looking for a command on this linux system without smartctl to give me a list of the installed hard drives with their SMART status.
Has anyone an idea?
Thank you very much in advance!
actually, I was able to find the answer using email and contacts at Fujitsu.
The answer was simple as can be:
# get_hd_smartinfo -d 1
1 is disk 1. Replace with 2 if want to check disk 2.
I did not test it yet, as soon as I have, i'll accept the answer for everyone to see.
I compiled and ran the chardev.c example from the lkmpg and when writing to the device received an unexpected error:
anon#anon:~/lkmpg$ sudo echo "hi" > /dev/chardev
bash: /dev/chardev: Permission denied
The module write function looks like this:
/*
* Called when a process writes to dev file: echo "hi" > /dev/chardev
*/
static ssize_t
device_write(struct file *filp, const char *buff, size_t len, loff_t * off)
{
printk(KERN_ALERT "Sorry, this operation isn't supported.\n");
return -EINVAL;
}
I'm not getting the expected error of invalid operation and the error printed to /var/log/messages.
I can read from the device with no problem, receiving the expected results:
anon#anon:~/lkmpg$ cat /dev/chardev
I already told you 6 times Hello world!
The device /dev/chardev is created manually using:
sudo mknod /dev/chardev c 252 0
What's the deal?
--Edit--
Apparently when I mknod to create the device it ends up with the following permissions:
crw-r--r-- 1 root root 252, 0 2009-10-30 09:27 /dev/chardev.
Once I did sudo chmod a+w /dev/chardev the driver worked as expected.
However, people have said it is not correct to do this.
What is the correct course of action and why?
A really, really, really straight forward and simple example of how to implement character drivers can be found in drivers/watchdog/softdog.c
You can compare your code to this example, which shows you how to do the following:
Read from the device
Write to the device
Present an ioctl interface via the device
While softdog is a very useful tool, its as much a tutorial as anything else. Alan Cox threw it together, so its a good example of more 'proper' implementation.
If you can post the whole source to your module, we can help you find out why your function is not being entered as expected.
Update:
It is perfectly acceptable to allow under privileged users to write to character devices! I repeat, it is perfectly acceptable to allow under privileged users to write to character devices! If this was not the case, stuff like FUSE, Modems, USB Gadgets, CD ROMS and other things would require root access to use.
What you can do is take advantage of group memberships. I.e., on Ubuntu, users permitted to use FUSE (file system in user space) should belong to the 'fuse' group, which permits granular access on who can and can not use that feature. Similarly, on some of my systems, a QRNG (quantum random number generator) is in use .. and is (you guessed it) a character device. I need to allow PHP to access that device , so I:
Create a QRNG group
Make sure PHP runs as the user (not anonymous system users)
Add users owning apps that need access to the device to the QRNG group
I hope that clears it up :)
I think, actual problem is the command which you issued to write is incorrect. Try
#sudo sh -c "echo "hi" > /dev/chardev"
If you want to run multiple commands with sudo then you should use command as shown above. With this, you dont need to do chmod and change its permissions as well. Hope this helps.
I'm working on a web application that needs to prints silently -- that is without user involvement. What's the best way to accomplish this? It doesn't like it can be done with strictly with Javascript, nor Flash and/or AIR. The closest I've seen involves a Java applet.
I can understand why it would a Bad Idea for just any website to be able to do this. This specific instance is for an internal application, and it's perfectly acceptable if the user needs to add the URL to a trusted site list, install an addon, etc.
Here’s what you need to do to enable Firefox immediately print without showing the print preferences dialog box.
Type about:config at Firefox’s location bar and hit Enter.
Right click at anywhere on the page and select New > Boolean
Enter the preference name as print.always_print_silent and click OK.
I found that somewhere and it helped me
As #Axel wrote, Firefox has the print.always_print_silent option.
For Chrome, use the --kiosk-printing option to skip the Print Preview dialog:
Edit the shortcut you use to start Chrome and add "--kiosk-printing" then restart Chrome.
Note: If it doesn't work it is most likely because you did not completely stop Chrome, logging out and back in will surely do the trick.
Here are two code samples you can try:
1:
<script>
function Print() {
alert ("THUD.. another tree bites the dust!")
if (document.layers)
{
window.print();
}
else if (document.all)
{
WebBrowser1.ExecWB(6, 1);
//use 6, 1 to prompt the print dialog or 6, 6 to omit it
//some websites also indicate that 6,2 should be used to omit the box
WebBrowser1.outerHTML = "";
}
}
</script>
<object ID="WebBrowser1" WIDTH="0" HEIGHT="0"
CLASSID="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2">
</object>
2:
if (navigator.appName == "Microsoft Internet Explorer")
{
var PrintCommand = '<object ID="PrintCommandObject" WIDTH=0 HEIGHT=0 CLASSID="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2"></object>';
document.body.insertAdjacentHTML('beforeEnd', PrintCommand);
PrintCommandObject.ExecWB(6, -1); PrintCommandObject.outerHTML = "";
}
else {
window.print();
}
You may need to add the site/page you are testing on to you local intranet zone.
We struggled with a similar problem. We needed to print checks to a check printer, labels to a label printer, and customer invoices to an invoice printer for retail store embrasse-moi. We have dummy computers, nooks, ipads, iphones with no printing capabilities. The printing an invoice feature was basically a silent print. A pdf was written to the server, and a shell script was used locally to retrieve it and print.
We used the following for a perfect solution with minimal libraries:
use TCPDF in PHP to create PDF. Store the PDF on the server. Put it in a 'Print Queue' Folder. Kudos for TCPDF, a bit difficult to learn, but SICK SICK SICK. Note we are printing 80 labels per page using avery 5167 with a bar code with perfect accuracy. We have a labels, check, and invoice print queue. Different folders basically for different printers.
Use the included shell script to connect to the server via FTP, download the PDF, delete the PDF off the server, send the PDF to the printer, and again, delete the PDF.
Using a local computer attached to the printer, run the script in terminal. obviously modify your printers and paths.
Because you always want this running, and because you use a MAC, create an 'app' using automator. Start automator, put the script in a 'run shell script' and save. Then stick that app in a login item. See the script below the shell script if you want to see the 'output' window on the MAC.
BAM - works sick.
Here is the shell script
#!/bin/bash
# Get a remote directory Folder
# List the contents every second
# Copy the files to a local folder
# delete the file from server
# send the file to a printer
# delete the file
# compliments of embrasse-moi.com
clear # clear terminal window
echo "##########################################"
echo "Embrasse-Moi's Remote Print Queue Script"
echo "##########################################"
#Local Print Queue Directory
COPY_TO_DIRECTORY=/volumes/DATA/test/
echo "Local Directory: $COPY_TO_DIRECTORY"
#Priter
PRINTER='Brother_MFC_7820N'
echo "Printer Name: $PRINTER"
#FTP Info
USER="user"
PASS="pass"
HOST="ftp.yourserver.com"
#remote path
COPY_REMOTE_DIRECTORY_FILES=/path
echo "Remote Print Queue Directory: $HOST$COPY_REMOTE_DIRECTORY_FILES"
echo 'Entering Repeating Loop'
while true; do
#make the copy to directory if not exist
echo "Making Directory If it Does Not Exist"
mkdir -p $COPY_TO_DIRECTORY
cd $COPY_TO_DIRECTORY
######################### WGET ATTEMPTS ############################################
#NOTE wget will need to be installed
echo "NOT Using wget to retrieve remote files..."
# wget --tries=45 -o log --ftp-user=$USER --ftp-password=$PASS ftp://ftp.yourserver.com$COPY_REMOTE_DIRECTORY_FILES/*.pdf
######################### FTP ATTEMPTS ############################################
echo "NOT Using ftp to retrieve and delete remote files..."
#This seems to fail at mget, plus not sure how to delete file or loop through files
ftp -n $HOST <<END_SCRIPT
quote USER $USER
quote PASS $PASS
cd $COPY_REMOTE_DIRECTORY_FILES
ls
prompt
mget *
mdel *
END_SCRIPT
echo "Examining Files in $COPY_TO_DIRECTORY"
for f in $COPY_TO_DIRECTORY/*.pdf
do
# take action on each file. $f store current file name
#print
echo "Printing File: $f To: $PRINTER"
lpr -P $PRINTER $f
# This will remove the file.....
echo "Deleting File: $f"
rm "$f"
done
echo "Script Complete... now repeat until killed..."
sleep 5
done
and the automator script if you want to see output, keep the app with the script
choose a run apple script option:
on run {input, parameters}
tell application "Finder" to get folder of (path to me) as Unicode text
set workingDir to POSIX path of result
tell application "Terminal"
do script "sh " & "'" & workingDir & "script1.sh" & "'"
end tell
return input
end run
I know this is an older thread, but it's still the top Google search for 'silent printing' so I'll add my findings for the benefit of anyone coming across this now.
We had a similar issue with printing labels of various types to various printers for a stocksystem. It took some trial and error, but we got around it by having the system create a pdf of the labels, with printer name and page qty's encoded in the pdf. All you then have to do is:
IN IE, go to Internet Options >> Security >> Trusted Sites >> Sites
Clear 'Require server verification (https:) for all sites in this zone'
add "http://[yoururl]"
and the pdf will print out automatically.
When we originally set this up we were using Chrome as the default browser, but in September 2015, Chrome dropped the ability to run NPAPI plugins. This meant that you could no longer select the Adobe pdf plugin as the default pdf handler, and the built in pdf plugin does not handle silent printing :-(
It does still work in Internet Explorer (IE11 at time of writing) but I've not tried any other browsers.
HTH
Cheers,
Nige
I wrote a python tsr that polled the server every so often (it pulled its polling frequency from the server) and would print out to label printer. Was relatively nice.
Once written in python, I used py2exe on it, then inno setup compiler, then put on intranet and had user install it.
It was not great, but it worked. Users would launch it in the morning, and the program would receive the kill switch from the server at night.
I have it working all day long using a simple JSP page and the Java PDF Renderer library (https://pdf-renderer.dev.java.net). This works because Java prints using the OS and not the browser. Supposedly "silent printing" is considered a browser vulnerability/exploit and was patched after IE 6 so good luck getting it to work via Javascript or Active X. Maybe its possible but I couldn't get it to work without Java.
I have to be honest, I am kinda thinking out loud here.. But could it not be done with an applet or some sort (be it Java or whatever) that is given trusted permissions (such as that within the Intranet zone) or something?
May be worth investigating what permissions can be given to each zone?
Following a Google, I think you definately have a challenge, so far most of the articles I have seen involve printing to printers connected to the server.
If its internal, would it be possible to route printing from the server to department/user printers or something?
If it is just an internal application, then you can avoid printing from the browser, and send a printout directly from the server to the nearest printer to the user.
I'm on the same issue here, this is what i learn so far.
A.: You need to setup an IPP PrintServer
You have multiple print server implementations you may try.
Hardware IPP print server: like DLINK DPR-1020 or similar, some printer have this functionality builtin.
Linux server with CUPPS : http://www.howtoforge.com/ipp_based_print_server_cups
XP-Pro server with ISS: http://www.michaelphipps.com/ipp-print-server-windows-xp-solution
B.: You need to make your WebApp a client of this IPP Server so you pick-process-send every user's print request to the PrintServer.
PHP::PRINT::IPP is a php lib you may try (it's well tested on cups servers).
You should have a look at PrintNode. They provide a silent remote printing services for web applications. You install a piece of software on the desktop which syncs to their servers. You can then send printjobs using an json request and they are instantly printed out.